Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b509d599c690648…

MALICIOUS

PDF

103.1 KB Created: 2021-06-28 00:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d176932adb3aa4aa83da4c7c0030e4ac SHA-1: 9d38e9ee1e49b195e7554599d5f84b26cc9f165c SHA-256: 2b509d599c69064886ee76de9a89d5cfd229272687ae1f1eea8bc40cd13c7fd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself does not contain readable content, but the presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=a+longitudinal+study+is+one+in+which PDF link annotation
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9de153877---tonezinopefenefoninejamuf.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/kolevegopawubiridu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080faa686fc0---tipirub.pdfIn PDF document text
    • http://thedreams.cz/files/demaz.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/277eaf1db67a0be920f16daf33228db6/kofogewufuguves.pdfIn PDF document text
    • http://gerocuki.hu/user/file/fujuveme.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/99379941256.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6d1d3ae2---94674812959.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/65068141194.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2f94356907b38ab283387d3daad34006/fopuda.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7cb148afa---kasixilelidit.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/29182258955.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/tssigt6nglui36qsqk36pfk37k/bolunajezus.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/6838911522.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2d3d31732380ea54762fa1ee79aeea89/93547153412.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/marikadesajer.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083743f39249---54070594210.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/61d96a77a31b5081d8932a4ee4631875/rexuzozaxeripixakavinox.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5423aaf233---13140003404.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/46143991476.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73e43d040c12fa44a0c1550eaa936178/70330161503.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f19ee862eaa6b3c9dc80ef2a19f2bc06/jufisoratijaxujikelo.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/76879cf434c372447bc0aad3f15c69d8/53217980061.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_off00012d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D71 18288 bytes
SHA-256: 0164168b8924e2694897ce32316678c6f09fd707cdc6418e14783e9453c72553
font_01_sfnt_off00015e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001762b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1762B 10832 bytes
SHA-256: 01dd93e26f3d7c3a14a323039cc51590a051c5654487463947ca52b4adedb50f

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