Malicious PDF — malware analysis report

Static analysis result for SHA-256 50925a3f5c3a0d31…

MALICIOUS

PDF

81.8 KB Created: 2021-06-29 03:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c363631027829f1cb4fae2fb01e1107c SHA-1: 396fee84c72b6f515010573a879de0f8b89dac57 SHA-256: 50925a3f5c3a0d318192deaefce5d0954a36a84171bf23ac86115e9863f46a55
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is detected as a phishing trojan by ClamAV. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely lead to further malicious content or phishing pages, aiming to deceive users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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 https://laborke.ru/uplcv?utm_term=friar+lawrence+soliloquy PDF link annotation
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/a34620657ebdd024b01c77d7aa42f4a5/tenajig.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da08b97d94d---46230717321.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/gfo20acsuelsv723ikoqk9h2b0/xewazuvubifotude.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/silg36eb75m01i1pm39vi0k570/rivuwozeri.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bda97a00179---gujojufisofunidopuzigata.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/30500081099.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb0b509721---57615613729.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c78bc9b4c4---woxuwutemidavina.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/2du3cn60vbtbhdb00913n87ob5/kumiborivatunima.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/9c651a8038a348e18fb80fbf65332f10/73284111502.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/t9amqqrof4c9qvrfo8o4oasih0/68330310816.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/58989565001.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16088920a29651---sofawajibud.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/lvvb68sqi09vb78f7us3r2qa75/rajatavofasekowukirekoja.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160757dcc54a4b---kemokesunizuvezulozivaki.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/kegesetixeduvu.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a8890de3f64---17210515631.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c2256448f---bitigosolodikixil.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e4ce05656---23560164664.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d54f5cb39a---34152999156.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091f8f4d787c---20811093996.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/ccd21493f5c6296b4393f3dbf5d56b2d/tesagididu.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/90b7994174a343a0509fd12ae3a43e31/84661447226.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1a11ecac---nijiloluvotimetexinimosab.pdfIn PDF document text
    • 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_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 16844 bytes
SHA-256: d73d66b529c284431d70dc5d0eb3329768e57327e79f5089313f02b839aa29a9
font_01_sfnt_off00012063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12063 10548 bytes
SHA-256: 45ad10025b767afad6e87b0dd771d114630f0bd7c64c7ad16dbcd561b68c921b

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