Malicious PDF — malware analysis report

Static analysis result for SHA-256 0626e57c7e78d506…

MALICIOUS

PDF

89.5 KB Created: 2021-08-30 03:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bb2449b85b8233ce46143c7ac443f8d0 SHA-1: 60f2fb626bd2112ff88744fe5b7ad092668668d0 SHA-256: 0626e57c7e78d50603d847c588b8fad678a9c4838d43b09a739f22ee4d16da34
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites hosting PDF files. These links are likely designed to lure users into downloading further malicious content or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0c70caa44---fumamo.pdf In PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/77cfce97fd0fb482edae101df834e596/lisuwexo.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/12332875151.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/fewujul.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/33885887387.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda1ed003ca---revibi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f8069d4c955---tidinudoma.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/worenukupusasotip.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/24623250086.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/9f95fac6afdc4d6d6362a9a83e2cfb9d/29336134358.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/43f4dfea8c8a496806babefbc6cf5147/pataxorimesufobuxavakim.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/77649143810.pdfIn PDF document text
    • https://congnghethucpham24h.com/upload/files/xapokejixazaledi.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/97183282735.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/mubopovezoxijozetep.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd76918599---memidekevozopan.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b2cc9086b---jifabij.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/dediwapegewunagimutojala.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da4095bc30---fanibukiwavox.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f846f09f21---xawozazijakufevoku.pdfIn PDF document text
    • http://muszempilla.com/files/file/xenuvuxipugofejo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a09066bd7f---madetomezefimudavojaman.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/2716922009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=atkinson+%26+hilgard%27s+introduction+to+psychology+17th+editionPDF 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_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 9728 bytes
SHA-256: 829cad9d49db1960fc4462a28b1dd19a139edc75a5d15f6dc43c901628be6d3f
font_02_sfnt_off00012565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12565 19480 bytes
SHA-256: 1b77d11e0e4e187432291dedf4cb86970e1ef939ae354ca4522e4c3d255af51f