Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba767611b40e1787…

MALICIOUS

PDF

90.5 KB Created: 2021-06-28 15:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b2c93915530b1f1f356a3a6192e6732 SHA-1: 964f2c4e3f1b2c5cce29dadeaf9e84a6982b88a9 SHA-256: ba767611b40e1787b1ab923192deec38c2249518f4bc149c379983d310771fd0
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress installations. These links likely serve as lures for phishing or to distribute further malware. The document body was unreadable, but the presence of a 'callback phishing phone lure' heuristic suggests a potential social engineering aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7a0960278---30752907649.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0b4d9ed35---76111091722.pdf
    • http://wildpflanzen-planung.de/file/vulejaxutidivo.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834e9eea730---topute.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da5b4a1224---36410902334.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/dabevepamofopo.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ddbd8cb61---11588167083.pdf
    • http://aclamerica.com/customers/CMS-IMAGES/file/33886331242.pdf
    • http://girisimcilikproje.com/resimler/files/81997343537.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff04b6468e---vinujekifiviwizurusi.pdf
    • http://bdn10.cz/files/file/notexedosoxipujuvenuta.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/1408e65895372196e3e0a9fc0f200e9f/8832707964.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adff38804cb---27601409027.pdf
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/32429968302.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/9cj6tojmvcd3omu24na4dvjqm2/76050258301.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6ed576091---xevipi.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e697a838---kosudikokiwizojepozurof.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3aa9ceb3634a1c869d161fdb877f1a03/vonuvozafex.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/i6ikh486cirumit5141bvuvie6/lawagebufonipifeb.pdf
    • http://beastyenergy.com/userfiles/file/40331363108.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jnmnaog65jco9nrdl8pr5knkbi/gigenagexifusozamuvapo.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/8075e86fcc3a86089b0c7dfae67ef813/roteje.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34a3cac946---84505824970.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/598cee6e51fa884b0d92d8a42a49ccac/betumutinemopon.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=iphone+8+size+vs+iphone+xs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbdb.bin
05f81ee524e4149ee9fd2aefbce6d7fcbacd46c979ad39c4730e36322a3f7dbc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 18724 bytes
font_01_sfnt_off00012d59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D59 16792 bytes
font_02_sfnt_off00014570.bin
d02ce11b519c4d87aef71ee3dbd320b569cfad51b6ca5898b753179941687154
pdf-font-stream PDF embedded font (sfnt) at offset 0x14570 10332 bytes