Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13f280f2731fb0e…

MALICIOUS

PDF

96.9 KB Created: 2021-08-25 13:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 80da29f86414572032bd30b76063128d SHA-1: 68e4510914bc74bd64e5c55b4a2ea95b7193a7c0 SHA-256: a13f280f2731fb0eb079413e952e50900ea7a0173448189419fa61937b54992a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier clean score 0.1887

Heuristics 5

  • 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
  • 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://www.pattyn360.com/upload/forum/files/91142765631.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d3e4c739---9531575855.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c25a0499098---98220109974.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/b53b9822675659f14ff0ac9e139711f5/8083056443.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/kehqjkmjn1u4r8qauatd1m78kp/forigizekifa.pdfIn PDF document text
    • http://bienbao.net/uploads/files/superizerenatigepa.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/zewiliwivabunesaxuvun.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/daminidotudujutewapotege.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/3vog78cfheuvi6b6oq657qhas2/45513283847.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b9f1b936d---78099009120.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/tudilolexuwurikivububolos.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/9515316821.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072d61d474f8---bukoxixanuperipatifed.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610537cabd87f---jawogojilonuvobuwifo.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/beratawafusa.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/42234536301.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/vinonisomarisugali.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/99445233145.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/4873215474.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726722465ef---dasivewasubimulo.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/27126225852.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/4837874737.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16084f87273508---vusimogareguxosigawubid.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/37af5bae8f88aa1f4f0d9d7179eeb46d/pufofig.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/75983346605.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/vafivisosizetamewuxukega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=opm+classification+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C21 16620 bytes
SHA-256: 0df10277e937706c1222f84e92e318e0774d5636e9293feb3ed714e867650c36
font_01_sfnt_off000166db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1