Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf6c5cf85278f8c…

MALICIOUS

PDF

92.1 KB Created: 2021-07-18 12:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0d821dac80dd2864e9d8f03864eb97f7 SHA-1: 944a5c5fe85d0c187a62656bb1ba3f60baa69eeb SHA-256: 7cf6c5cf85278f8c7b8b7b930881cd4964bf3c2901f856b86685276275539b17
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.
  • 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://fwullong.com/upfiles/editor/files/salenuxojodi.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609650e319e80---vivivukanuxetafumuw.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/gegux.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210715_152152.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/cec9cb7c1dee5285dd0e2703aa1ce2b9/85239620636.pdfIn PDF document text
    • http://ipublicity.cz/data/file/48182728165.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/44417948583.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78ea1f2f4---suwuzatemikewogesim.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06bb796306---75910687216.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac65300e0fd---rewefonulekusexowu.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/45682236527.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1829be071184935e03a12dbce2563007/82441108360.pdfIn PDF document text
    • http://growourworld.com/clients/83159/File/33469918387.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/korofon.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41370d36cc---kebozejedap.pdfIn PDF document text
    • https://ovalpolycoats.com/media/9845196776.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/90381217281.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/46302196612.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/eeqbg6q7rm0fm0qfsggtr6rodl/najupezoxosixonugi.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/3556614089.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e024fe528d50eba362d6d66d7a5059c9/98753976302.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5e0e81e23---26533476021.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/gonexavokugozezedoni.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/34154834053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tally+gst+entries+for+practice+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 10872 bytes
SHA-256: 939e8c728ba6f8b5a2cd468e20ed154fb5ff59bd8b42540a228d0df6830f612a
font_01_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 1780 bytes
SHA-256: ee6d8c25003eb2de61ee1fda640ec7b8e4605923364b71ee832b966c85f0f81c
font_02_sfnt_off00011863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11863 19040 bytes
SHA-256: 8c9200020e83b5ce12e9bfc35b1a29e2c24bf6fe482676ce1cfcf2ad4824629c
font_03_sfnt_off00014a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1