Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4a75dcb7b02556…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 02:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a9c094fc7435efb23ffb4ff3cefe397 SHA-1: d752f7cbaa81a9f8d105e1684f2287f26e59de4b SHA-256: 6c4a75dcb7b0255656deba79db6370df40a51d75fd5338ce5bfad325272f21ea
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs and link farms, some pointing to compromised CMS upload storage and disposable hosting, suggests the document's primary purpose is to redirect users to potentially harmful sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its content, but the heuristics strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=lyrics+of+mma+mma+by+buchi PDF link annotation
    • https://razredna-nastava.net/files/verarimuzavipimezijazamu.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/desogebu.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/33809035082.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/66653147645.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/vowolejibasu.pdfIn PDF document text
    • http://generoussecurity.com/uploads/gazafoles.pdfIn PDF document text
    • http://anpo.vn/upload/files/91047205333.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/sasenaxedilurur.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161466140993b0---logexadojumisonewiduzen.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/37101415462.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/98324901129.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139445b835df---20322669770.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/75056406864.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/voniviv.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/dutimodukulewapokigova.pdfIn PDF document text
    • http://dnepropress.net/files/file/fobepar.pdfIn PDF document text
    • http://c-six.it/userfiles/files/bipebaletonalak.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161473179c3636---25477014732.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f19891e16---nukevogetamagixer.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/36030146702.pdfIn PDF document text
    • http://szwygs.com/upload/13430043072.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/52589604035.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/jibivoko.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_off0000d501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 10532 bytes
SHA-256: 02939bdee0cf3ce3811f428775138f11c27a00b6357b953e28ea21e74dd86a2e
font_01_sfnt_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 17596 bytes
SHA-256: 351b4ab27336f22af607f720663e62cbf44aae1d5a7c628c692f36e1a385d88c
font_02_sfnt_off00011a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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