Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fcc90170fe50f1…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 00:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 925ebdba9b7fec97ab8eb5ddc4dd5e86 SHA-1: eda3614b85e68435a01996415a08562f431487eb SHA-256: c9fcc90170fe50f1abe2cdc9f0e59af777960b416d4f57a7c6815222fed0c8bc
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The PDF also contains numerous external URIs, many of which point to compromised websites or link farms, suggesting a phishing or malware distribution campaign. ClamAV detection and ML classification strongly indicate malicious intent, likely related to exploiting PDF vulnerabilities to execute code or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=a+patient+medical+history PDF link annotation
    • https://rkdestate.com/userfiles/file/24244505512.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/7e799aeb19520b490bc49774c1b17ff4/bowudekivukokirat.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e563c0a210d---zuselorudagixedamemusak.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/hkiuhgkdquhf4jvp9f2i5cnebl/42942083521.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/85056896641.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/13619441570.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9fc14b765---zimemibanejadawel.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/zipegumigogenotogi.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5dcf89814b---pobokoloxabunisej.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/bewapibukuvad.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/fupozifekaketodinilum.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3987aa00d---xetilosumega.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/99732627560.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b4c08334---53521229612.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/gdjjqhbi6flmurvaadi157ops1/95039229861.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/52910923083.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/20001336647.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/90044014145.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16102c711ec264---lobuwidowi.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/dksitvfjbjdvf31dc3k2r87hr6/relonowuzekibodupir.pdfIn PDF document text
    • 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_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 19716 bytes
SHA-256: 69143e96f1e0336ff6dd069a75d8b07a7a2d14ea0c72f2deca9eeec376035c3b
font_02_sfnt_off00013068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13068 10876 bytes
SHA-256: e5a9c618b732a04d96ab4e7e1ec4db6d8a0fa3cfa8bc7bad50a2501060bb8d00

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