Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a99d81b31427704…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 06:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7a10a1bcc04d01790a2dbd61e3b4bb30 SHA-1: c61c06171f38df359731b93cf85a5ad707b0a531 SHA-256: 4a99d81b3142770481b91d4186e46521228016f54add2ed67f794318491e31f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL targets are indicative of a malicious PDF.

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://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/f8rcfn89bjg8dlrempm6qr345f/zuribidokag.pdf In PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/56667967292.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b21e83b2086---59299594921.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/96042640026.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608294d7aeff6---lerigus.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/85217732850.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/diwuxoramafin.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/73774083962.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160925bcb94db4---kejivagazuvubesolag.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/retaz.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9c12d1f36262b2d3fe8461bb00bb0c5a/78927118256.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/95619862919.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/87454334475.pdfIn PDF document text
    • https://superpart.com/files/norizavukavivileberuvu.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/fizat.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/40246207034.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/45641899708.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/feje0eot47hh19er2eu493qvem/81691362155.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/bakatal.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/meritejuwugegef.pdfIn PDF document text
    • http://jar-ted.pl/file/jaroxojumalexewipotig.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/xawafaserowawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=an+introduction+to+sociolinguistics+janet+holmes+pdf+freePDF 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_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 20116 bytes
SHA-256: 8d9733786de60bd3e3f14b526caaadffddc1da9ee865532329d78c953bf5aced
font_01_sfnt_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 11276 bytes
SHA-256: a125610809d249a03511f872dd459dd9e3996e384145cd1de11b8ff6ad0f0395
font_02_sfnt_off000126bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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