Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31b11172545875f…

MALICIOUS

PDF

100.1 KB Created: 2021-07-25 21:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8ac56e8d2a9332353d34e20eef094d72 SHA-1: 1f51ed8d032f4776f148ebd0d300b37ab3b5902c SHA-256: d31b11172545875f0b37e9df9ad1ab369c26f048d74202bc36cf9ff7e06399be
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160781a147ba11---69774498193.pdf In PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b0c108ed1e80e0b49175075e0f1f8459/51176607066.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/a22350n4h5qofoq14emmffqd8t/saxasukuzanamexupiv.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/zalideri.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609834b061938---77742618520.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/27167cbf128b741bab11925c24ce8718/dofukalamoruxajoro.pdfIn PDF document text
    • http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/83681820491.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8f2cb751e---21830026754.pdfIn PDF document text
    • http://faxik.online/ckfinder/userfiles/files/43261253137.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/33137695795.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b310e3464---vuxozufidepopom.pdfIn PDF document text
    • https://computerzone.pk/file/topamufemidojowor.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3b2ca5457---56292361791.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/03c656f93dd3a4128e5d201988b725b2/falasevoka.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/gg1p8u6h3u38fvvu59pm3deta7/50832057065.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/rakupabulo.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/vubanesamid.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c549e6cb975---tasologurosenarijewejutu.pdfIn PDF document text
    • https://securitydm.net/slicice/file/zakafedadopejese.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/jaxinewiwevuvon.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780d2c2b266---kafumigaxob.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/tikumiw.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/tvi6jsi24gklcl421qd6ajjuv2/56604090951.pdfIn PDF document text
    • http://renovator.cz/files/file/puvepusepomojagalu.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/07b5e2d5e0a2f21dc6b2075b28d643f0/97218652114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+benthic+zone+of+a+lakePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AE 10616 bytes
SHA-256: a71881dcbe1199f56ea95530d9a8236855b0f94924a5fd7677e2114b15f6f938
font_01_sfnt_off00013df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF4 16940 bytes
SHA-256: db1a983c7a1ac20d66749a00d5335b82a3db55b79d23ca361c12089e30a2c0ab
font_02_sfnt_off00016a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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