Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1f1ad1f26e54aa…

MALICIOUS

PDF

90.5 KB Created: 2021-07-05 23:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c400fc8f6a1543db972feb5d3bbb643 SHA-1: 5c5c38b0db91e36c242d2f7056917d71f5934748 SHA-256: df1f1ad1f26e54aaf4a4c65fda00401bcdf018502f33a3c1ee195bcbc991a211
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the 'Urgency / deadline lure' heuristic further support the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=tell+me+about+your+skills+answers PDF link annotation
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/mt5rh8geu1uk1i5sq5ftkrvvnc/kojotatejevefimuxasulad.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/voxezik.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3b2d74453cc61a8ae10fc21c78283a0b/fibakipa.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/6al5shm18rgo8ns7jfr6pg01f8/19738432181.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/612d8973982f93de3b2f272c660606bc/dupuvarifirajoxoxemo.pdfIn PDF document text
    • http://jfe.hk/userfiles/51213920133.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/434fb0f291f9b839d03cf83d6f678033/76071658991.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160967220b66e5---3987238357.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a273d5ce2a2---jamuditorefig.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607df717f3ada---37576794474.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3afdc9d8---55306992840.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912c70d48af---peburelitinawinejedebivev.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6e89db028---13111547226.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a49646427210c2e6ce2cafdd3a716c09/60560375183.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/96bd66f62bf3b4c445a756f52a57c7dd/48071939426.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ifofgcavc0rvc1h6etha7rbm7f/sibixunol.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/ed1e7662e17aafb0d5006c1c520cf6ba/wuxonoziwetitemo.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/79464829872.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609321e5514eb---45421663870.pdfIn PDF document text
    • http://podushka.by/files/files/tivabijorutuwexalesonosu.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/mewenajevaxixoxopemufe.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fefd9d6b9f---vinovepaxolixitap.pdfIn PDF document text
    • http://jkohut.pl/file/4735124269.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/23523158674.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160af702cc761a---39620414671.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/12959577126.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/lesomijit.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_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 17516 bytes
SHA-256: f176413f83b80a1cf45e98dcbd660b493cc2e95c9e894cdf32e701962cc265ae
font_01_sfnt_off00012ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA9 10764 bytes
SHA-256: df2984871023edb79270eacde3dc83860dbe55c6aed434153b80c5427b6e8e3a
font_02_sfnt_off00014485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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