Malicious PDF — malware analysis report

Static analysis result for SHA-256 365360e744a681dc…

MALICIOUS

PDF

89.3 KB Created: 2021-07-14 09:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f7086c1606eb2031f0a1c7dad659a13 SHA-1: 80dc1582be29f3135a6f51410f4e2db7f63ab4c9 SHA-256: 365360e744a681dc761729453fdd951b3760018e6b2520df1c5a6ca2ed01de20
156 Risk Score

Malware Insights

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

The PDF contains numerous links 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. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/80b551cb5879184c10d018093f45bab4/84846451283.pdf In PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/888568176e8bf2bf50c5cc613ccbd0e1/wepexorogokaloze.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160717f736d7cb---85952430116.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/12815829874.pdfIn PDF document text
    • http://orderkai.com/uploads/files/kepusojagebewogagil.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd36b6419c5---46549825561.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/7221456943.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/ropejoto.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dhqfjgts9u4jnchouiu86a5jd7/92218074924.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/tivojaxajeda.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/dogikanarev.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/85a462087431be371207e89d8e924c83/32069709938.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caebb7b6f57---kogaruseji.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/pokosebilizegij.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/a598a6360871adba5bd7227d8b28f16f/labiji.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/nkkiv9v93o8c446o8las337mof/kulojidomazamike.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/33972750047.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/81395087954.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5a5b44255562706e3ff5d566603af9a/29870443338.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/b15etan7jmt9shu6hd67je5q6d/24894520143.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e4757ed797207aa8ff346496a20d9708/kiwun.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/efd92bbcbad97632417365ce53b39462/93549981256.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/18ff156e4ec732d3ab08c548dff2acd2/96279291416.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/2e24117878d3416f849384cc44bbc782/nujizosapov.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/jomapowas.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/22096448e4dc45055e39c710522c24ec/kajijumelimilovama.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608987b7c34a8---lidalorinefupitilikuf.pdfIn PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/fefidivexojijoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=g325a+form+samplePDF 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_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 17420 bytes
SHA-256: c0a66c0e84a36e61b4689a572106f2732ed7c6bc5b253702bbfe8f639363c6cd
font_01_sfnt_off0001270a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270A 10688 bytes
SHA-256: 45618ecdc322fb06b6ae958b281a3fc7ef9a85e7378ccbb9c8b2acb962bb3103
font_02_sfnt_off00013fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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