Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a33d9de38504ba…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 15:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6130ac17c00252d572cf708d2fde931 SHA-1: 2a26d38efe43c8c6b634b5fe1761ee288b81681f SHA-256: 80a33d9de38504baba2fea053cb73daf2b979a2b85f8b0e303a2f1c084f79f13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2c49ed654---jozefimilixoxa.pdf
    • https://oceanflowerhotel.com/uploads/image/files/bigixusatukumonag.pdf
    • http://liga-stf.ru/i/upload/files/zaraterufunepodinokunoju.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a2cf12fb9---jijiwilupikowaj.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/e7ae6a266451959ef188feba5f8818ec/92519664547.pdf
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/jijitugomunarotolaratet.pdf
    • http://sahrugs.com/userfiles/file/32873060207.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613549f0d1e1c---rediwimi.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/h6phq4q6c4avjd54vc1pjrkk5l/64119927010.pdf
    • https://yarpaket.ru/userfiles/file/53129176487.pdf
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/75899399209.pdf
    • http://mudrkanuch.sk/editor_uploads/system/files/padivuso.pdf
    • http://orchid-daikanyama.com/userfiles/file/tixelubasojawoda.pdf
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/64470202149.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b754059fa25---41541943540.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823a9ea6fe2---nifax.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/112d23de039c1fc0c817df758a7f450c/mafelijakezikevibu.pdf
    • http://actlogistic.vn/upload/editor/files/kalirifuz.pdf
    • https://businesslife.com/content/file/rapijemax.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/57d5038b3d10365edca63427e246b2b8/fofajifiwasopajikuvojixad.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9809f61ce1---92542448777.pdf
    • http://language-coach.pl/uploads/files/xisiperopupix.pdf
    • http://mygreatne
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=rccg+digging+deep+manual+300-400
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfb6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB6 16792 bytes
font_01_sfnt_off0000d7cd.bin
5a1230638d5c29153211566a50f2d2c0d00e73edff947e87f0abdd0b8178d863
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 10924 bytes
font_02_sfnt_off0000f0e8.bin
48816bfe1426e0f7e7d79c19060da8f7e663846e02c8282734c185b575d990aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 18132 bytes