Malicious PDF — malware analysis report

Static analysis result for SHA-256 85351972a5116eda…

MALICIOUS

PDF

82.6 KB Created: 2021-06-27 22:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 614874a94fbb4a7413300b8b16c882d9 SHA-1: b490cdd40076824077331b12c4866fa3c0b0ff2e SHA-256: 85351972a5116edad7bd591ee4c9b14848153a15fdfd702ea449acc4793f4691
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, specifically identifying it as a phishing or trojan PDF. The presence of numerous links suggests a phishing or redirection attempt, likely to lead users to malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/17d486edb23ac648ca26421ee89e31ad/12608138775.pdf
    • http://micronforgacsolo.hu/UserFiles/file/zogevozakaketiruxa.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d67a8c8d68---56682230095.pdf
    • http://diclenakliyat.com/userfiles/file/farelevokilerogu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda59bd1e6---26711978134.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021631251443404.pdf
    • https://angelsstaff.com/uploads/file/61705187755.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/45efbefe6388a632717731ad69f1b7fe/34863485056.pdf
    • https://martensmgt.com/business_school/uploads/file/37977589426.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0bec22a1e---jofoxugapibunovuvur.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/97318dcdf84e8d1ed41d18b1e9775798/woxuzekusinasetegiwuvuk.pdf
    • https://isosklo.cz./uploads/tumomipoxotuzufobanibufa.pdf
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/96401ff84e9e7ea9a948a0d58b658aca/fenaruraledakusoj.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/64dfa051711baa6d5fccf37c90fbdb4f/wobodadurugapevu.pdf
    • http://konsultacjenaukowe.eu/Upload/file/xifefowotaguzagekixoliru.pdf
    • http://cobansut.com/userfiles/file/52471073183.pdf
    • http://www.kickcommerce.com/userfiles/file/tinodokijitufetuwixasuna.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/rmk4pih509fh119nfv8e456t73/9452534834.pdf
    • http://andlupa.com/userfiles/file/josalakofegejosujika.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/05b6a69c926e9ff6c8d7bdd6519a7965/86600774930.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/15159b7f1a6f1b1c668774eec89d156c/feturasazimirep.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6bde3560f---73058048167.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=maths+mixed+word+problems+for+class+4
    • 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_off0000e012.bin
6c7cea2c261546f0e187b9d46318186afc26861816f756b9df43a7d9e192b0e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 16592 bytes
font_01_sfnt_off00010af3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 16792 bytes
font_02_sfnt_off0001230a.bin
7113a9e24ee0ace91ad83a902a5559b257da002fb389d21f11e67d9622b84ada
pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 11180 bytes