Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6c43ef45989326…

MALICIOUS

PDF

87.8 KB Created: 2021-06-23 23:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf06a545f27168001c0caf3c288d81df SHA-1: 7d7f1131c77b4386edd2d338f5da520dc92dbb23 SHA-256: 6b6c43ef459893266749d0590843c3cde4301319078bbcd453d56ea04818b858
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites. The heuristic 'SE_URGENCY_LURE' suggests the document may contain language intended to create a false sense of urgency, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607168ec3b351---21350511955.pdf
    • http://zaun-produzent.de/userfiles/file/81640529725.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090721fc4000---6713309387.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/79924b39b44c4b11f9bcc404d6fc1caf/lolumuluxolinijajeb.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/61852483317.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076963fc1042---817877729.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160906363c6bec---46286559945.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/p7teck17kvn5olbgfohtlplmdj/dujemodirebug.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa07c107e9b---dilutubetisorijiso.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a017f108f24---fumobavabe.pdf
    • http://kusadasidentalclinic.com/img/userfiles/files/96492316369.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57f531e359---10673259734.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3c420b0fb515bfa26ccf211c7be37ce7/40206557293.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pdfelement+6+pro+for+mac
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9d.bin
91c65d4daef29bab276e56b606f9c5013e4f13bc29c78e9eee33dd87ab02342c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 2996 bytes
font_01_sfnt_off0000ea61.bin
87cdebd1f53b0e3ec9b5dee490edd85a5d270500836ff95778adc34186862e60
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 5020 bytes
font_02_sfnt_off0000fb49.bin
4bf7e88649b31a4b23f4f4f784aafebb23a66dd22f33d220c3f6e951e78c8f52
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 20784 bytes
font_03_sfnt_off00012dab.bin
50c8c2658d4ab23fa7a49de5526b1a2dc8c293f5b997ba4a137803ef6067b06c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAB 16324 bytes
font_04_sfnt_off0001431b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x1431B 4324 bytes