Malicious PDF — malware analysis report

Static analysis result for SHA-256 171223933c92664f…

MALICIOUS

PDF

72.7 KB Created: 2021-06-19 12:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a18e1308167b1f6722ac0f649ca65e72 SHA-1: ce122fcc0d8034851bfa307a2c684edbf87d36d6 SHA-256: 171223933c92664fe1c3c0687a08a8962468e9ac0d398f8d8edae4c515597dc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The embedded URLs likely serve as part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://archism.ru/uplcv?utm_term=how+to+find+number+of+atoms+in+a+compound+from+grams
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9282dfdbf---wogenoferatinimonox.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac785b0fecd---83326989291.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/960f074fba2cce9800b2c2d3a6195f73/rebebixufolutis.pdf
    • https://adikkeempat.com/contents//files/xowutijed.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/19632128601.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b04774356dac306ec7c35de806d2614d/dabupaxof.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/g52lj6m5vm0pu9mk8v6pehlpt3/tatokudatudegotabusifij.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160803ed361634---1475012372.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e57fc1c81---lujoregagibovoxu.pdf
    • https://imagebeaute.fr/userfiles/file/43388988835.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a42ad6caf1b---koluf.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j4ptg1oq2loj48kn081deaeub7/kezoxe.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d19f3746581523f3b334d5d04467f3d3/1838908120.pdf
    • https://okinawa4d.com/contents//files/sipijuzulewu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd0b.bin
9cfd6f6bc58a06230e85206cf9368a33c7d7405a405a3299cf89e209438e1cc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 5636 bytes
font_01_sfnt_off0000f02f.bin
445c5256f03074052e770834565652ab7f88cea319471a89c9a87b01ba45f1f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 11024 bytes

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