Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d7939d26cf22b3…

MALICIOUS

PDF

82.7 KB Created: 2021-07-09 10:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e0573a32bbf5719291f3ad612c186d38 SHA-1: cd1033798de73d65c2dfd5a2475ecec3f5dd1893 SHA-256: e4d7939d26cf22b3c38a5984f80df659349519641ca8fba5bcaa1ef1e0cb301d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and heuristic firings indicate this PDF is likely used for phishing or distributing malicious content. No scripts were extracted, but the structure suggests it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2548

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13b37d2f4b---podakorubonezarolefejex.pdf In PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021070414214273499.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/tm53t3f33earufr1e3l38c4ul4/26009773352.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/81096671989.pdfIn PDF document text
    • http://furniture83.com/upload/files/47459501310.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/bovupexukirizifarejo.pdfIn PDF document text
    • https://quaint-house.com/javesemuvokixod.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609873baf3445---47499450998.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/brjqq2dcvqlj6asifqt2tognrk/ledatogisagalimizosigasu.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b388479d8cd---terenafusulezesawizarugok.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c935bbdaf49---rasemuferewunobomol.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/12642061665.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/5r63anh8ue8qijhir5ri7s453l/goridajegad.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ulks3elv0sdrm148dfh2gu6dk0/valugapinegobowefonikikum.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/8n7qbu7mr4fs2u9d7etl86j1lc/kimawanuzanisejawuva.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/42099339970.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a008d923365---wofavo.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/muworemo.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160877d865877d---demimipafozuvat.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/de931a063472a3d9ea553fb5859b21c9/menup.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a9276a1a225---vaweso.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a30c5b6459f---85042860988.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/gajidoxomuzafaxezibemar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+convert+excel+file+into+pdf+onlinePDF link annotation
    • 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_off0000ecdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 10528 bytes
SHA-256: ada24ecfbcea4e9920751a77b8839047e55b16297784a05049e10573072283d8
font_01_sfnt_off000104e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E9 16604 bytes
SHA-256: 6a1d6a9516a11d4101787934c4373f410fdc91016e9a8a0cf6e7393c84d3c6eb
font_02_sfnt_off00013032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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