Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d937a2c197b29f…

MALICIOUS

PDF

94.0 KB Created: 2021-07-03 10:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: acbb595005c5ca021f09e9f523ef1eb9 SHA-1: 7bf3d9398513ffbc931649bbcb074bc7a5b3e2ad SHA-256: c9d937a2c197b29f6377f5f6f59f0e2cd7a1df5102e1877b2f6849cdc75db371
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various domains, many of which are hosted on compromised CMS upload storage. The document body is heavily obfuscated and unreadable, suggesting it is not intended for user interaction but rather to host these links. No scripts were extracted from this sample, but the presence of a link farm and the 'SE_INVOICE_LURE' heuristic indicate a phishing attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3c54f2fa347c6d6a0265a88a0e2931b1/32011192139.pdf In PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/59c910cced987268c69cc2898e973889/31421244788.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/55169784306.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d473728bcfc---zedonekematamerokevepa.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/8503202200.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/027003c3a61f5d09f807d4eea00240bc/podoxamamovinewifejosewob.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/39729941464.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f278a0daa---91923132413.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4acbb696---31890503440.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/fbe748786bd5ddfaa183ada1cbb0fb9e/dajusewuvevezevebebu.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/96006845984.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/lusuwexetazupivijuwib.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad42742b804---36206250389.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/mesogujadugafudaxo.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/8tv2a3mv5n56somct3gr3d4e62/85087629434.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/a69830761f5a9d19a3f9ffecf0cf7f94/jajigesokaxikemupaxudi.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/810c6cc59be1089c59949fc88e0b81ea/ropalijubexu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/95326541378.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/3749250333.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/nurabe.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608251ec4c2fd---kojogofexuboxafuwerazaxa.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/fqkdbiotf2g3af7hpenv5cc5hp/38312795361.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/9025713359.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a78c7621e97---marux.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/38180371049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=thank+you+in+advance+for+your+anticipated+cooperationPDF 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_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 17024 bytes
SHA-256: 4e73f2062cf4754f20ef17f21df141a411c34759e46484c91ca8e72d37a24643
font_01_sfnt_off000138ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15105 10836 bytes
SHA-256: 3c4ddbbdeeefc2283586b450636b45a801c41ef84fc1001afa5481a7e0ef8918

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