Malicious PDF — malware analysis report

Static analysis result for SHA-256 111a2d48e824f8ec…

MALICIOUS

PDF

89.8 KB Created: 2021-06-25 13:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e4efaa0819cfe7a140a2e194ecfa2bd SHA-1: fff51a6d137943139aff3655712fc6477235326b SHA-256: 111a2d48e824f8ec916782b6c7a634bd9080ed543222e7d59bd5662eff6d80fc
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. While the document body is unreadable, the presence of many external links and the 'link farm' heuristic strongly suggest a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cbec3dac10d062301271a25f8477c992/busifa.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/g45q26j1bv96t8m8gcdo02i5e7/1183888442.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608c35249dd30---23171505565.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898f282a068---30540018506.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2339a21c4---lomezowumejawofokamixone.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/8720acdd8853c960dd950170d92096f1/96151650215.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/0b4f528a32b30aced853e291be4d6a91/bujuvenojomijuzolenoser.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9ccbe3cecdb61fe3d3bbfa61db494bcb/lelamifuvepusejasazakob.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c5601250b4645f0862eab2c931079c2a/3582056517.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa9b82d64c---84842625250.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f6bf2a347259059a1cd3d0ef39b62128/nenelutetegakog.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/35cc36affd1713fac435d53770e187d2/fivizakisegasexipasiled.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/lirtoqvutg9b3l5rg97v19r66d/dorevufulazulilazu.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/6582378b4a546bfd71dbdf7a9ed0402f/dusaparomo.pdf
    • http://bannermaul.com/userData/board/file/32276922892.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/gliqq9vj6p6tvcfuc0s6r0cr5i/5281900970.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/bnl7buaqvh0qkjc4mrggoh5k94/tanitimukud.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d684c46fc705f86cf7acd424a4ad2ec7/30154069394.pdf
    • http://asckhn.com/acskhn/userfiles/file/letusevifejiwidifubek.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=japanese+akita+for+sale
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 16792 bytes
font_01_sfnt_off00011479.bin
c0668a92088b240f3d1e12de3339cf174f5ae78ee146cd544767463dd51c662a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11479 10432 bytes
font_02_sfnt_off00012c41.bin
7c123f06421c0d22bb490807b6a7e1e7b08ec6c50a5bfc703ca05c95bc4f53eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C41 17844 bytes