Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8af7fc6c59f2b4…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 14:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d16a59af2dcc0ba7663ef9a5d0b7e85a SHA-1: affefdfdd929d930c405f01d16fe7a501a37b661 SHA-256: 0a8af7fc6c59f2b41f2389ff5b7191468d068fdb2227773c61dfe8d93c607841
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/cjo8skenad1k69vuplsg00u6go/33644998067.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cdaec9309---dinegogajodejaled.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///96127635819.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210626_002126.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083a0cd7ed80---mefonubupemesetawef.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/74852467510.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/67659570949.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/72477253080.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/f32pr4ae92gjvr1tpubd6m6g4u/45757822190.pdfIn PDF document text
    • https://ghnservizi.com/file/16351244599.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061905571448.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/dizunok.pdfIn PDF document text
    • http://immopolignano.lu/images/11120670124.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/fuvotalofisekigevubis.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/83794912096.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dbd0dd4371---1151568005.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/18144737408.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/6943a69057df0c5e0da960bfb59df53e/mitanetosazol.pdfIn PDF document text
    • https://netlandschool.cl/files/padilame.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/bidipakanabarewufa.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/22591597153.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/8441927120.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7368da6ed3bc97c9d62b969d012dcddc/nivawoxebazuvupufimami.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9279e18bdf---xuluzurek.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaa34bcd08---25110215578.pdfIn PDF document text
    • https://stopserv.ru/files/file/suvamidexenoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kawasaki+er6n+2009+service+manualPDF 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_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 17840 bytes
SHA-256: 0b783d72e388e6a21ba12c4e10ae2617d589b716762c582855ad3210068ee494
font_01_sfnt_off0001169e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB5 11088 bytes
SHA-256: e4f2f9183cabc21034ffda75395a2cb2e2f8da064b80166a2ef5d1116c7dae0e

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