Malicious PDF — malware analysis report

Static analysis result for SHA-256 684d7afe7cb69e5a…

MALICIOUS

PDF

74.2 KB Created: 2021-06-11 16:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 761637bbe3dbc80e9de109b3f977453c SHA-1: 11dc20f0240cd66556b686c13914c4c0620ea243 SHA-256: 684d7afe7cb69e5a84f2d3220256ee95ff40220eab4fd6f069a9d85ca3176ea1
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress upload directories, suggesting it is part of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ketchas.ru/uplcv?utm_term=how+to+make+crunchy+slime+without+glue PDF link annotation
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084f6b7b6e6e---vixufiziwasafejipavadom.pdfIn PDF document text
    • https://ms01bet.net/contents//files/zugofov.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aee2bd4e28f---88478045026.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9fb13ddac---5224761847.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160982bf71be10---42452802064.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc13b5d1a66---59501708518.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92b8ac829---vumapa.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d3df1e1202fe51c04af265f3cf4faf5d/sexonu.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/pojodudemezipifus.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a45eca27269---nipan.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/7339467316ab5f05613ab42fc5785001/57334008418.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/6346698387.pdfIn PDF document text
    • http://poiskvod.ru/images/file/baxetofagovinufarokumilok.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/27490527437.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/160801b83a8782---53330694615.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/kezeletejamofonazolufo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 5432 bytes
SHA-256: 9d71fae75d47bc3338b1df6768963631b00b7d84302b82e0eb4fe7d31f91f38a
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 10336 bytes
SHA-256: 220877a861ea7e5a607de8af07d3b596e315d8520788a7da41854f49a3aa9bd7