Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d2b52c9129959b…

MALICIOUS

PDF

86.3 KB Created: 2021-08-03 23:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f25d94084852d7cf7d515a4b6ca54ad SHA-1: d781307a941ac096aaa4476d182731c6c76cfe05 SHA-256: 37d2b52c9129959bf1aedae7bc8e98a67c850179dbdcc50c907a1c1456291255
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a small PDF acting as a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure to malicious content.

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 https://garglob.ru/uplcv?utm_term=how+to+change+vivint+doorbell+battery PDF link annotation
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/81131765795.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e163c1a4c9---61141948602.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2ca3dd46b51be32217e0408728f2443b/23145009722.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/qed43i0dci8m761e5ohc3lub31/91000790298.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/d0f6921ucqqoq5edklihlfs11h/bimekojuregekasujewu.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/66444801772.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e802ac2a0972af53f9b4922dff4d31b5/32155604425.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/bb69295ec5de1c093e3bf2f227741e30/15971898249.pdfIn PDF document text
    • https://o-dance.com/upload/files/buxazedabulakumizotod.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/vojuja.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/87853849173.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f15e466aae---xoxetufenilej.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/93457852965.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/8969650740.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/ruvadadatagorigalulerolig.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/7774061303.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/79540811616.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/de45f8f6ee0df9fc1afa64e9064a77f9/foxona.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbac1b2d8a---zexabemiso.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/wewir.pdfIn PDF document text
    • http://pronobile.de/catalog/file/74487789053.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3fb3de704---70398079996.pdfIn PDF document text
    • https://mszukam.pl/dat//file/wipafatidisivemuxiwat.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/511607545b3278c3ed5dbe6e5afe4ec1/turifujenetokezuzafin.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/74d74ef6a22f5f082b67cf423d646609/fexufazuku.pdfIn PDF document text
    • 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_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 16556 bytes
SHA-256: bdf8e28b1f62d6400aaa9b2e332ea5c96e83f4c57d45518a68bf30985252855b
font_01_sfnt_off0001198c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A3 10876 bytes
SHA-256: e8191de4d04617660186d7e6700fd432677cd6c2b9028ab8a7fd38a65ee32408

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