Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2ac2e5e0d79f45…

MALICIOUS

PDF

84.3 KB Created: 2021-09-22 09:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f5456030598bba25c88fbae47f1d0fcf SHA-1: 3ebe82701baa50908cb5d90288491d1c21d1e06b SHA-256: 3d2ac2e5e0d79f4508870559b1f2f27882a21f07a8e34de90225265b0c2856db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external, potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=change+font+size+on+android+phone PDF link annotation
    • https://moolans.com/uploads/files/17616155909.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/88617318613.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/jekuparekekudutari.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7r9fsrmgsihh7lhphdsj95g6d0/27225960631.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/zoxezibolad.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/38557696327.pdfIn PDF document text
    • https://funbugs.ie/files/file/pimikoxetefu.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/35984492478.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/880f9b3e2669a7a62c8bd942b022fc60/mugomip.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/gaporutubijiwevelorubebef.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/77483453754.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/85805990879.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/96239233248.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/wavigulovav.pdfIn PDF document text
    • http://belniig.by/public/file/35520607547.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/f8293d9cae20c5de4165b39af3852496/44301203914.pdfIn PDF document text
    • http://hk-keber.de/images/file/ropirupuf.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/zodipisimogotarigolu.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/rofedo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b1d87edab3706a073239b4c0cbbb9b10/71335014348.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/99636417461.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/pudubutubezimuvop.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613671bfbfdca---farizewuneka.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/eeulftpt3r9dqfqubmsftedga3/raboziwipulo.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_off0000e27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 18536 bytes
SHA-256: 2a24f9d976f24c5566be67d96a1fadf451909f4addc44398cdd57341f5164332
font_01_sfnt_off000112a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABD 10820 bytes
SHA-256: 3bc91f0f8808a0dedc3fcd2f14318e9b78b90a5327360dd297c991a0ff3ecbdc

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