Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d30a30915cb0a83…

MALICIOUS

PDF

87.5 KB Created: 2021-07-08 10:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 35080e0408440e407af79b2dd8f1e20e SHA-1: 63314f2068aa50a73224f8cb6b39895c62a6003c SHA-256: 3d30a30915cb0a83afa7b01132e52d927a65d0896459720c80b9968d067ae565
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and links to numerous external URLs, many of which point to compromised WordPress sites. The presence of a 'download button' heuristic and the ML classifier's high confidence score suggest a phishing or malware delivery attempt. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9e3d5b6247ebacd09add314ec8f0a68e/82407202208.pdf In PDF document text
    • http://leaguengn.com/userfiles/file///dulilafekenepatibas.pdfIn PDF document text
    • http://beiks.info/public/file/gogugadowojawizukepapixam.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bb7fcfc99---5368931657.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5929fb7f---lawawajukajevapo.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/48155183925.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/739d0f977314fb6c4d68eaa9a678686c/letaza.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075ff8a5e797---tatewobijopopujedi.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/legokalox.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8a4a6cc8cd4b76980689a5197a0e8bab/47169315392.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8ed59770---sipetusoxopup.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dafc399e378---kubokopawis.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b20b83d6a46---91149155551.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/xisojovesevivimalaralote.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/fixep.pdfIn PDF document text
    • http://hevolta.com/upload/file/xanejiwawafugef.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ef3599b5c---29422151264.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/36786089789.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/43287386969.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a141d2a3f56eb8db8c3f8c69c29d7ae8/norusufumowiwa.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/salajobukotu.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2607d381d---52073582228.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/67hqmn5v8a57jcj889fv8493ae/93534453074.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d15c29083d---fitajaropuwi.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210502205008759364gzh4vp.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=clash+of+clans+hacked+version+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 17112 bytes
SHA-256: 7c5b065d547be145f408c0b73e4bd2aa6565aaab77e731178a7448e5ca4fc64a
font_01_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 10664 bytes
SHA-256: bd152a4316b26f49d53322b00c0abc0bb0de3bf4011aa401878aeefa886a3a61
font_02_sfnt_off00013826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1