Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5b28b99e4a4aa8…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 20:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 79bf87d2a9f591f205b02713e5d4c631 SHA-1: 5628a692809541998a0bd38dd14d39c8dd324320 SHA-256: 7f5b28b99e4a4aa8fb7b3c88ed4654710c296c88cc5013c3e7ad455d53f08a4e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://tensoinox.com/userfiles/files/58479809188.pdf In PDF document text
    • https://kluchar.net/klucharnet/images/file/91502842840.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/sigigop.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/96496757195.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/42819938781.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/8512423235.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/57566146630.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jd4l21mlrn3c7of5mjf0n9gtgr/xubolesenelebajow.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/zukobisu.pdfIn PDF document text
    • https://unitjaya.com/contents/files/pekosaxenofixepo.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/16598738779.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/vabojitorifativobilozil.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/fususuzil.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/64335786477.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/kuripezodogeji.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161500bceda7fd---65013567481.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/likagipafaker.pdfIn PDF document text
    • http://beiks.info/public/file/22589462520.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2abb1d0d36245c1d062aa318425005cd/42634634334.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/88905376430.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/gedes.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/dutimavapawojulifidepotok.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/67150326489.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/85496964520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=super+mario+no+flashPDF 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_off0000b130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB130 15596 bytes
SHA-256: 72210b1b8bda2cd565a6e0cc469b93f27382896ebc757a9f7b24e8773ba612c9
font_01_sfnt_off0000d8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 10700 bytes
SHA-256: 45b51985b277dd2b215a27aa345d028382df5bc82d196cffd1e4b8a47adc477a

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