Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34dd702ed9426a3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 01:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99e4d90aaee43c407c11c79fa9cbb2af SHA-1: 1b24129c21a493378b5469b3f845a4cb0bc2266f SHA-256: b34dd702ed9426a351aab56e015d6a0f0a953041b63243ec29b6b37f5e8741c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it may leverage embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=online+story+books+free+download+pdf
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/saxibewafefaleto.pdf
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/6710595719.pdf
    • http://skipjackpoke.com/ckfinder/userfiles/files/73887206949.pdf
    • http://swatimishra.in/uploaded_files/userfiles/files/23142459459.pdf
    • http://thedreams.cz/files/bugevidutivivul.pdf
    • https://oreopay58.com/ckfinder/userfiles/files/83269278947.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/77f125c6cd15aa574b5b72dba46ef612/difudumusi.pdf
    • http://sinproval.it/userfiles/files/22267706706.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47d28608f5---49200283057.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d078ae2158---26039611901.pdf
    • http://orthopediedelft.eu/files/1772203272.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/efe5c1f5cec09cd6991f8343f1b22cae/tazareviw.pdf
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/79188064056.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6ec8d638b5eacaf2a12cfbbf00024161/vajirewamole.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc293a40f8---borenatoxudukekumezir.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326eedc1cda---20868629032.pdf
    • http://hagelkonzept.de/userfiles/file/60203667740.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/roo6rfntoubmesb7preec5km24/79667048592.pdf
    • http://studiotecnicobonoli.com/userfiles/files/34306885031.pdf
    • http://valleypainclinic.org/userfiles/file/26961176364.pdf
    • https://audreyheselmans.com/_files/file/folugipevas.pdf
    • https://stvorki.ru/files/file/68786913835.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5a9.bin
864f6d756336a5be2469d35b093a03d887af7946eea040d0870c7f24603779e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A9 16332 bytes
font_01_sfnt_off0000ffda.bin
93445a108175755b3f83b9dd018ad825fc32b99cee35455338f3b3d23ed9090b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 10948 bytes
font_02_sfnt_off00011947.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 16792 bytes