Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa93e053bf5ce1f0…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 03:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1336b0148bec0b6ae09e4f8095bb6eb3 SHA-1: a48989aa986d7c6011d0ae54169e75123daa2511 SHA-256: aa93e053bf5ce1f02dff5935b38dd9334d2e7dd5d54ca0ee41b4402737d2fe92
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to link farms on disposable hosting or compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://bantinnhadat.com/users/files/vubav.pdf In PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/52574273845.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/kolikulu.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/tuvowow.pdfIn PDF document text
    • http://bscartridge.com/pic/ruzivatoxijexavajopixesur.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/68965586888.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/vilixigerugugefufizoz.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/62562361369.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/15491018768.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/zorup.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b86766e2---87166444834.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210916_004934.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/kipakolifidovenizipenos.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/fd7e7956f9f609aae071ce4a98017253/zabijumif.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/93237015015.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7dcbfbc10053de1fbf590d47acef0c5c/juzawakeginajevedol.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/tnt2kgfb14pa3g6obtsodnu9dv/61911379192.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/20203484527.pdfIn PDF document text
    • http://inphilong.com/upload/files/971075249.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/50185939337.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/zubafekogamurawurevavuz.pdfIn PDF document text
    • https://brukspec.pl/upload/file/57673690212.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/nipasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=amazon+prime+cracked+version+for+pcPDF 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_off0000d235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD235 17528 bytes
SHA-256: 42a7d643ee0cbcf17129e6cc0a11fff8597b1df251aff89e3ad60263c61e9da7
font_01_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001180a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180A 10836 bytes
SHA-256: 29ccc33f55a5efffdaa68210b69f6ea8fa5ca1487c2358aedf711777ba551415

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