Malicious PDF — malware analysis report

Static analysis result for SHA-256 6294ffb5567212d3…

MALICIOUS

PDF

90.2 KB Created: 2021-09-11 01:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c7ded56fdd3e542476dc79151cd3414 SHA-1: 95d8927da519b54cf97d3d00a96daf41a2deec58 SHA-256: 6294ffb5567212d36648f6cf351210ab9f7bc851d674a21e3985109546458ef0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of threat. The file contains a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting an attempt to distribute malware or phishing content. The presence of external URIs and a link farm heuristic strongly supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://synerhu.ru/uplcv?utm_term=midasbuy+free+uc+hack PDF link annotation
    • http://ecohost.ru/pics/images/file/juxawapimajufanujif.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb17594b1---bavupibabirunugutonarebar.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/wamukes.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/38715882489.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd86604642---tivefagusefoxejilunof.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/97071951652.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139c9e83d319---82480650936.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/39588251913.pdfIn PDF document text
    • http://alptw.com/images/files/2401170792.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/32494798883.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/mejuxipesus.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a20ef31494---fajavutulatatigizipupaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa7c87674e---safojiguzoze.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/pojejifi.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/68337872600.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/18447560706.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6c8b8fc2965bd91b1611aa1f295e3ba3/64043393280.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bdcc40fc9---waforaw.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/fekawawigeguguba.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c465e3ad3---nojubonezidirumaxomababo.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210909_C0F45D4B63B9A027.pdfIn PDF document text
    • 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_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001101b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101B 19308 bytes
SHA-256: 765ce67d780be42deaa2008afc9235c8bb8b7470e9bc5885378553c09193037e
font_02_sfnt_off00014302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14302 10644 bytes
SHA-256: d8291d85f1038da58ebea81ebd6c6b10110e0e9da6154f4809c54b96d26b7a92

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