Malicious PDF — malware analysis report

Static analysis result for SHA-256 b757002b2a157127…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 18:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52775a519bd616d032d60de6358969df SHA-1: b0fd168b1cc0d69e9305a8f45ff881aa21b7641b SHA-256: b757002b2a15712716593bcf6d266e9bb2d0940f9ee5af0544e8148b9d93f097
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest a malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/074a81ab85d96fa827a9f33fb9441b85/5013850838.pdf In PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/8243f5392ef664c25bc36db115f1b055/71086997259.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/welanerokivuso.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/gemaxudapejusunagalar.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/xawefolulofozonas.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/rebejibuzajalawuw.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/53805310384.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/c69ug517p5g3brng9l442qhtoo/59697062879.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/dugiverofif.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/71644129974.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/97079283021.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/pukelumiw.pdfIn PDF document text
    • http://oicenglish.com/imagexx/files/nonolafinepivupakerez.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a6b70a82cc---80985258214.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078eab0ecedc---72587611174.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/0av0i7su0dj46pvmih35bd33v7/91062595785.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/pexegevenunit.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161295f921cebe---jotonejigefawe.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/92104761901.pdfIn PDF document text
    • http://zxsolar.com/d/files/bimuti.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e57837b8e---xogopapepapibep.pdfIn PDF document text
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/30240769665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=economia+macroeconomia+y+microeconomia+pdfPDF 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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 19224 bytes
SHA-256: 39c7bc3a044df2a48829743f51e9936444cb72115a4ca98cd2cd6228fffbcfed
font_01_sfnt_off00010d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 10564 bytes
SHA-256: 581975ba7b1988a9ecb63d4cca50758d459b7a2e09a9f83257cac5b4add8be2b

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