Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb1383b05e6e7a1…

MALICIOUS

PDF

89.0 KB Created: 2021-07-25 16:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 50caacf80144be8a1a9cab6710fe7fdc SHA-1: c494f3763b806ade4c4bcbb4179205acfad1a8c7 SHA-256: ddb1383b05e6e7a1438f460e67569c40c53fc6447ab488e44a2d7d0bde55530f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories 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 delivery through these links. The presence of external URI heuristics further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://phuclocvienjsc.com/uploads/image/files/mirisujozu.pdf In PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e6fed26bfacc018bd1e709a77aff0cc7/78396139453.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1819d654---71908370099.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/46438123462.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d3eece4f3---49694025527.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ebdac5a1bbd88612a96532acbd6ddb73/bivulatonokisuzibevefebem.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/pq9ar7rfeesn9revq2qimefm2p/87044829983.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9cd5f0e598---29955450726.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/hsruc1jdurdb7ghab3qsrlpoqj/jiwuvapirosegawajidako.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/59099844398.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/xalutoviwetotelotonexe.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/juwiparumomigur.pdfIn PDF document text
    • https://wecareprogram.org/images/file/xakipivinebufin.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c18934e8d4f6fe37c1423fc1e83df00d/73788589581.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/30353000504.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079ac599432c---femejexitune.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e21fbed78---xemelobufekopise.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/86b10a947454c70365c4e813d1641ae5/robiwuziwelejilelob.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/kixub.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/54368865475.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a0fbd4167---bikisiditofilaxoz.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836e261a86---gupogugifekizobubum.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/72683477744.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/86667203731.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/60647989375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=descargar+emulador+de+xbox+one+para+pc+32+bitsPDF 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_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 11492 bytes
SHA-256: c02931de6048315d369f73090f2e3c7e20afc699c20db1b950b660ddc3be01b1
font_01_sfnt_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 17292 bytes
SHA-256: 4e9939310232fa367e111b68f258504ceb68283a9b7999cbc1461a265bd554e4
font_02_sfnt_off00013a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1