Malicious PDF — malware analysis report

Static analysis result for SHA-256 4196b8687d7b4a4e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 12:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ae9fff0ef087f5b6233a9d44a309e200 SHA-1: 91b35b46ce053b960908d43cd7a5a6a6546b2195 SHA-256: 4196b8687d7b4a4e2619588889e8127db6b33be28335e226347fdbe7cacbfe55
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. Heuristics indicate a high likelihood of phishing and malware distribution. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://catamma.ru/uplcv?utm_term=bca+resume+format+in+word+download PDF link annotation
    • https://kaptenhoki.net/contents/files/sijilelafagorukopatu.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/59777023158.pdfIn PDF document text
    • https://apizf.org/public/file/38691281166.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bab262650a5---7121434213.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/52994382876.pdfIn PDF document text
    • http://cl-pub.com/files/files/16067232215.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dbfc3d000---56141479934.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b9cf17d42---69023836584.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a0227b7e7---55772392247.pdfIn PDF document text
    • https://4appsoftware.it/file/29130071314.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/tabelazixigisedezoze.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/37669285986.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8c40f54dbe95ebbf1122a6d5cb4cdbc7/91037055924.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/45056032435.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/54258931824.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c429a5195---75277312971.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abed082a9cd---zujimexawate.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/19089513742.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b558041ca163a831b28901d7e8ed8ae2/8571020595.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/98d4a1d732a7a1dc75ec3089bec7ff9d/migizogufawebipavisivevo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/62c700b11a441f22c3f0fd7f9c87f8ef/48185572874.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/tokadefagoladufezegozale.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_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 20076 bytes
SHA-256: 867c09b3ac699ffb30bb64f33500145b3f1686cb54c5aab269cf28f83e9a1c3a
font_01_sfnt_off000110dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F4 10876 bytes
SHA-256: 487fc55c1123e3e18880ae256fa777eb2c1a6fb8a25597862ba9f233c76ce765

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