Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ca7c9f4c886ed2…

MALICIOUS

PDF

85.2 KB Created: 2021-07-20 10:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c2f7075bfb70f43529fd031ebbc13528 SHA-1: 6bab9aaca677bc13ba9ded01dd6ff55c571978ec SHA-256: f8ca7c9f4c886ed23824dd77fc701dd4d7596f4f6527aeb3af20f99f4a1beaad
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised CMS upload directories. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nhasachconggiao.com/luutru/files/pamunafusijazotodolutiref.pdf In PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/khlpd864ftsf568o483emhr2qh/85546117640.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/d6a9d604ab00fdebfefe2fb810ddcd70/40138013430.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/lebujatufaluwuvuxonej.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210717_7FA2D2295B9FD42D.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/32b425d47a63323690f76c9d57e371e1/64828200911.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835866b04e2---65833590643.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/wenolak.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/laf6u1kkf3ccv86tq5miqe5ih5/43359103752.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608598c7c837b---15664407039.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/d7e9girmrenaspkis9ut25h5bh/93327716603.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/7veoiv8566hknokd4kffagrdd1/86696120210.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/66472642341.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/9jojm6fv54ja13j49nto5qpe81/pujegirixinadaja.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a8a0a5728c1755b198bb05d7468990d9/gipumokamedovaf.pdfIn PDF document text
    • https://fallsplat.se/file/rexizupuxajego.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16083920fa24d0---3438965039.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/b50de317c4bfb15ec994848364754e70/4714952338.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/473da905df3755da9bcd1cace08f513a/98060723748.pdfIn PDF document text
    • https://etimes.mn/uploads/files/tawiwetoran.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/1acf0c39778e2a310a26a2629ce806d0/16092334173.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/24238815168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=1984+study+guide+answers+part+3PDF 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_off0000e857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 11284 bytes
SHA-256: 47d52771b01ddfcdf17200b585732474273ba8e0bed8837334bdec63546cf073
font_01_sfnt_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 17196 bytes
SHA-256: 8bb62994c05eae187bd28b81e4c1965da6e605b2138b07f97991a6869c13c5d2
font_02_sfnt_off00012fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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