Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bba2c7300d98c2…

MALICIOUS

PDF

75.8 KB Created: 2021-09-16 04:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c716ab102bd20c15c7e794c3f5377525 SHA-1: 825ae14fbdd4a4d83ad66efdb1681f75c1018453 SHA-256: 58bba2c7300d98c2ba48e734d57221b50f509774017949225daea66e9b8ef65d
172 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and a link farm pointing to external PDF files hosted on potentially compromised websites. The presence of a visual download button suggests a lure to encourage user interaction, likely leading to the download of a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • 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://bleikss.com/userfiles/file/99434704798.pdf In PDF document text
    • http://occahomesearch.com/userfiles/files/41583245911.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/viweg.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/fevajawugekupakimuxoxikiz.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/1735668310.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/2997611854.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/55483036975.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/31774365699.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427ff8e4a08---rugezerek.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca7d9e22ad---88511423858.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/ruregiv.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/80876334919.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/28655072636.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/84340497560.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613260cdc821c---12122280287.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/50440663980.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/91302205882.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/17898764213.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/zofigit.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091522173973499.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/66169768248.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210912234815.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/53504ee9e06c6259ada086ab87ea7803/60161858437.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/tapolurepos.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/733plm73u2rfdfkkc6a6srfuou/12888147450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=top+rpg+android+offlinePDF 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_off0000c6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB5 17120 bytes
SHA-256: a13f4789962352967244b6a4e3c3f7f40c38502279334ce7f785032cbca057c1
font_02_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 10372 bytes
SHA-256: 36eeb3b281aeb74782c6d9292ad0b358244aa8613803327ee656de3761ebda0a

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