Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ecdb8ad0a23973…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 21:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: acf79a1382ac9de3c5f19b3cc0dd89ba SHA-1: ef3505162d2edceab5716bf4447260521b813df6 SHA-256: 78ecdb8ad0a2397318ca20f19e76594c0ab422df1d03309e7f5b28a473484550
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as a deceptive tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=autocad+2016+keygen+windows+10 PDF link annotation
    • http://homeshopeez.com/uploaded_files/userfiles/files/12680127118.pdfIn PDF document text
    • http://bdsductri.com/upload/files/33585389038.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/313f70df751447885e116ba4ebc8d837/45722382775.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de1b2914a1.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/47956324712.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/95738497868.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/20307201522.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/kawoniwebivivo.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/41365452541.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/71643213451.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161306588668f1---59952397960.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/sipigixusunok.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/miruxelenovumonapuvovoz.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133ceda19533---pedetiv.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/91bfb8ff6e3318ef73de2f2a8786b54a/misebozineliwefutixopa.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/gbqm812b1k1212imm7g4aqurd1/25492979734.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/fuzafesafixomoxatik.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/22161302088.pdfIn PDF document text
    • http://rayer.cn/d/files/98636638853.pdfIn PDF document text
    • https://dcimx.com/files/40119373619.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/parujax.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_off0000e635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE635 11232 bytes
SHA-256: b60a39f6f5bd03faedac2c1b556d5f26e42790c420c1b2ebfc79601a9207adc1
font_01_sfnt_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 17108 bytes
SHA-256: 75c313d5c8ce5e01d138a512813feece2c46d05e71d4d34fcd70b8c167ca43b3
font_02_sfnt_off00012cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1