Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b95aafaa8031338…

MALICIOUS

PDF

96.3 KB Created: 2021-09-03 14:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 69a626a4a491b486cc44fb8e070292c9 SHA-1: 7a158ed21282fdfd1a3ac250fa0a5ede58dc74ce SHA-256: 3b95aafaa8031338371c053fa53cb62fac3723fc4a3fcf4bafe0dbf09d8f7a0d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. The document contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting it is part of a phishing campaign. While no scripts were explicitly extracted, the presence of embedded URLs and the callback lure heuristic indicate an attempt to deceive the user into interacting with malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dambi.pl/userfiles/file/86484073563.pdf In PDF document text
    • http://cs-golfclub.com/ckupload/files/30038727953.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160765cdeaab11---wugumavakonezebebe.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/vojagarosef.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086f0e56b027---83487396599.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfddf230ce7---5693104970.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0f1be8792fd7c4759dbe5f35d1323d63/32364395164.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/38012473555.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c299a8be---76826114598.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/lafasejeregotaw.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/h0mh3qhtrdrllbnh76o03dq0jb/61419751220.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/wuxisimul.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/5970ac5bc2b9669a2812a3def2280c6e/77880303653.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089573b88fd1---71983725330.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5ba339ac559f4cafe194d7d0ee7415b5/35775698057.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/15005693765.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/monamuzuwezo.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/61192799754.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/40a9f710f70b91c9d31d8f417229ddf7/fixolesidi.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/61143724589.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b31acbaa266---34555555754.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86896a6348---28363124523.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/2d241e8affebf7261c7ea46bad27b522/19916772177.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/3949746989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=2017+gmc+yukon+denali+user+manualPDF 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_off00010fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B3 18844 bytes
SHA-256: 526c98125ac23dc6b1d88a1e59d93deb9908a81437ca692555bdd6d63e9f69e4
font_02_sfnt_off00015920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15920 11168 bytes
SHA-256: 9c6d8a93fb17ba313c3e7d09020bb51095c1c88844de07a91efbe9227ff18b52

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