Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1b94c739adbe01…

MALICIOUS

PDF

68.8 KB Created: 2021-10-04 22:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 74e69a150a66440901b748e6f7813b6e SHA-1: cff8a6bd4a5affaa0bdb22010c5fad9c60497a83 SHA-256: 7e1b94c739adbe018231f86fabb4c4b84c7fa1c80913fff43745a07932d39261
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. Heuristics identified it as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or redirection attempt. The document body is unreadable, but the presence of numerous external links strongly implies a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://bptramptour.pl/files/file/6653928717.pdf In PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/80sm8klova3noil5l9n4jskat4/zenilupix.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/tunivudir.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/11849068846.pdfIn PDF document text
    • http://aweibel.com/Photo/file/36295445454.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e3ec87205e2456d148ead57bd7f30cd7/puzexegisudo.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/furabazogagefutogaga.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109010544587866.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/35575850355.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/zabavana.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/49849776546.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/vokodixowiponofibufu.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/89990522985.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/50840348546.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/65c10469a7dac419beca10ca152cedb7/rojirogabusasupatubasasuk.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139780430999---bomire.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/borekolopujofavuluvul.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/70d2b9a9c28daa9790ff2d206d2989df/gowugogujozetezu.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/65458730505.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/82872456516.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/60290450586.pdfIn PDF document text
    • http://strandedtattoo.net/file/43826894966.pdfIn PDF document text
    • http://salespate.com/userfiles/file/nuvufalipasaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gwinnett+county+superior+court+case+searchPDF link annotation
    • 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_off0000aff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF8 10764 bytes
SHA-256: d41e0d84489551daf9fc4c4de410a4f1fcfa44a4480f3052b41cd7fe0439e8d9
font_01_sfnt_off0000c8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D2 14656 bytes
SHA-256: c600ab756acb7e112b74dabcc43a4b08616a6cb1a4f593c1826cf6cc5a0496b5
font_02_sfnt_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1