Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1ac19c7330f4ba…

MALICIOUS

PDF

90.6 KB Created: 2021-07-01 13:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72bfef3de49a8d4c878f76bd3b88b19e SHA-1: 6ddcb6c8fbb3bef7961d93c424ae6bd1583606de SHA-256: 1e1ac19c7330f4badef3c5ff8f6cb3e02a49b698ea72a86e996810d1d62e0d33
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS platforms, suggesting an attempt to distribute phishing content or malware. The presence of external URIs and link farms on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irantruck.ir/data/file/63365553116.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb68d51e4c0---jefazemalole.pdf
    • http://timandlor.com/userfiles/file/xunesodumamiborusuguken.pdf
    • http://csc025.com/userfiles/file/20210611002752_9xizkz.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/c9226eqc8cv5q65lrecdd61hv6/42160435439.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160abf772ae026---senafapeje.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e7879a582---majibagu.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-17/20210617011142167397.pdf
    • https://asiarsolutions.com/userfiles/file/19968090553.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3525c12f21f0378c775aebc7030c25d2/tamasofapeteseraxegatedum.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcd7fbdc2d---93370313524.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/19ae6c9075c997ce3019d920735f0d84/vabudogovuwixexomewetinog.pdf
    • http://funperm.ru/content/file/45306014721.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/a49qe8sl009q7j5t3jl4abct82/nawepet.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081c77cc4530---datoxevakap.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afeb94b67ba---danewitizelironuvexed.pdf
    • http://www.bluewhaleline.com/image/upload/File/63201718443.pdf
    • http://thaide.org/userfiles/file/85144053853.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/43280320814.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a907f416f95---91670183635.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=extreme+car+driving+simulator+hacked
    • 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_off0000ef89.bin
4adefef7aafb8af6e8f911481784e5d93ab4ae198a7212e4f1743887c05ba1ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 30952 bytes
font_01_sfnt_off00012ba2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA2 16792 bytes
font_02_sfnt_off000143b9.bin
7ba225e2f91ea7a47ba98985100d6e73d20d68ea5a27a56c9d08ff0111e5a18e
pdf-font-stream PDF embedded font (sfnt) at offset 0x143B9 11160 bytes