Malicious PDF — malware analysis report

Static analysis result for SHA-256 67971cd4c208fab3…

MALICIOUS

PDF

86.5 KB Created: 2021-07-31 16:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34a46069e13f41bd50a89067ec44764d SHA-1: 2d9d23b7f693fdbf4749a11c73b8a2e904fb1633 SHA-256: 67971cd4c208fab3d2c4cff5db075258e489d107e7aec3d9c907cdd4c1792f26
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3bj2fcecnn16npk5s43s16c03/10042652198.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/lupokuwivekikujavimuduj.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/cn56b7oaio8efqd4stvnkj08h4/63877411241.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f67d6221064---87832095587.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4e38ae323a36fcfd891c40af10cfd676/jupoxerawogekoruga.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/83973586617.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099c5788d153---kunodosapatexar.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16100f55736a9f---16326059075.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094871eabe85---38408905640.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/5087962874c888847f22fe667bf96a78/fenadigukabukoxipomi.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/lokanidejibamasavapel.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099bc13be78f---74330551231.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/48980119281.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/eebd0ef4573873971d2a722519fb17f2/49603291919.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6c76027bd---5698349308.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/petuxomilokuwifowesolowab.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d41fbbf17---59923772799.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/9965dd2428659c4cb57a72ef8fcfbf35/8311721155.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/fapavitawu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f38446e844---lowodumigonif.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/savivora.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/91588373726.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/q8uat0ki92p08uactfucl823em/73219068049.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/tibilitim.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe2d7436c5---wodemufuregododu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+sanford+guide+to+antimicrobial+therapy+2020+appPDF 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_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 11628 bytes
SHA-256: 0f6f1e9adbd9380cc7499cc138bc8d85455e5cbdd89ca8bc601c61954d83428c
font_01_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 17548 bytes
SHA-256: 4310cef077f925ebf7e15d1e6c33b1c5b8d389066f2277d3907df086a04f2ca7
font_02_sfnt_off000130e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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