Malicious PDF — malware analysis report

Static analysis result for SHA-256 681a9aedcca61161…

MALICIOUS

PDF

90.8 KB Created: 2021-08-20 23:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 424e3c00f427a3b4d3910f7aff1de872 SHA-1: 77e90f196e915c05dedfd6b1cdd9c768e0899c0d SHA-256: 681a9aedcca61161f54e83b3a26df1f7c365e53d087dd543a465a639c9ee8b25
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to lure users into downloading further malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination and potentially distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ab838325b.pdf In PDF document text
    • http://kamerton.nl/clientfiles/vikeganutosonoparewa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa6502bc0---31461969663.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/96800586206.pdfIn PDF document text
    • http://turnyras.lt/Files/file/84918946638.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/banolomo.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/51870024993.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/52847340293.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/96975786383.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/vezusomufet.pdfIn PDF document text
    • http://lemfhafamilylove.com/clients/a/ae/ae548a02e38cf20d1222216853584fb4/File/tuvaxuduxuto.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/gawubitijaj.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/15891733261.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/femejuvezivovu.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0b298138d---87535720776.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/birizipegosinone.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/45577051450.pdfIn PDF document text
    • http://vce34.ru/attachments/file/72751064127.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607690c2baa96---77565757290.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/15852902352.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/pukevezurusilapivipera.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/jefeganidabavimajo.pdfIn PDF document text
    • https://actor-conseil.com/files/file/64328513095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+allegorical+meaning+of+animals+worksheet+answersPDF 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_off0001018f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 16708 bytes
SHA-256: c95845cbb54607221d524697296b806246938b6ff7a6ee0c987073846e6bdf0c
font_01_sfnt_off00012bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001440a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440A 10924 bytes
SHA-256: 5785012131fbc8ac1ba76bdf5d8d8e6f915c3b006395889373b077581aa7f1d6

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