Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a5951cd5dc56e2…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 12:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 337d400b30ed1722f1f589b541dd9129 SHA-1: ff6245c448ee95d5e10489c5de7d35669c0db8f7 SHA-256: 49a5951cd5dc56e2e1a2054d3060c2a18d5d8bd94d6189c216ba278ada409e11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories, suggesting an attempt to host or distribute further malicious content. The presence of numerous links, some with 'utm_term' parameters, indicates a strategy to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3984d57e1f89b933124294b91c5d40a4/gaxopebofugiridifu.pdf In PDF document text
    • http://henzefashion.com/userfiles/file/89882920716.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109151548233845.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/72817781671.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133beab281d9---92196784567.pdfIn PDF document text
    • http://baove247.org/upload/files/wofuninotiwejifixos.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/smfiavi5na442gi7ifj5qbv0ut/xutolepeniripifetavuzuma.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/wepuviboguni.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/2568150782.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/54817260754.pdfIn PDF document text
    • http://kotolantopeni.cz/file/3407539445.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca728020e2---67163065826.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/beferosipuxafotovururi.pdfIn PDF document text
    • https://coevent.ru/upload/files/bovosivugenageluwutakipi.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/rurekodarapoxavug.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/20655584187.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/palutaxami.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/vidisujega.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/gufowikowadomiliviwiw.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e335bac84---27602493509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=scan+upc+on+iphonePDF 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_off0000d3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 18084 bytes
SHA-256: 1838e760d2fed09fa262a871392905a83e9122edb21276cea3cbb4a05a26b0e9
font_02_sfnt_off00011bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF8 10236 bytes
SHA-256: 229606fee29cd1f34f7d0706edc121881dc78395b1076746c8d797c5a110169b