Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbc4831119a426c…

MALICIOUS

PDF

96.3 KB Created: 2021-07-05 07:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ba638852734b6cfdf6894eed78d9588e SHA-1: 2269bdc058688bbb82b8149fa99c04ae433cd236 SHA-256: 3fbc4831119a426c2151214006fc98965a740dc9ce3d9d5087955eadd7a2e896
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be compromised WordPress installations hosting files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and does not provide clear instructions, but the presence of link farms on compromised sites suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f947c1191---35092225659.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52101de3c4---latefi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cc7441d98d4fa8ddd516be375cef2e6b/rozenoduwinejiseme.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/23988441795.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16082bbce751be---kubedixu.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///40463144114.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/df964257cf829d91a3276f94db766ef0/60542490891.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0jt4ragjivnuoevppobchqtvqf/21560098150.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a402b28b2c---85536846433.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/64264870630.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d7739e4e8c30bfac6381105645f3eb59/kadijebakakinofi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f8e988345e0203e1d7e3859dcc96626e/ratugusezim.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/jojikazo.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/59788368093.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2b4462288---6865332791.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/tajodo.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b8033acba68d142c2644f24462b15c0c/89179190799.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-10/20210610081558814374.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863988d769f---gezifogadu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160adc8fcd39c8---32310463165.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/qa30t2492atdr9l0i2l2o8i1aj/71303871558.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a08c035fc---54476610004.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/13444075726.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4fa494e3a39de4eec27cf56e766c4459/72917824036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=chapter+10+saving+for+the+future+answersPDF 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_off000110ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110ED 17744 bytes
SHA-256: 9097865f3c47659cae017aa0965c85e13bc5eb6613eb2d403b7bd80f653fb1de
font_01_sfnt_off00013ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001580e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1580E 11048 bytes
SHA-256: e9a3e44db3fbb634e32e92dd329c2fe2ec03b6d262e0130a278ab326a2dcf879