Malicious PDF — malware analysis report

Static analysis result for SHA-256 b622fe417d275aeb…

MALICIOUS

PDF

86.2 KB Created: 2021-06-26 10:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b98318447fbe933c7550dedf7b755d4f SHA-1: 6b947fa9f4a740f40baf78763d756d5052c86ece SHA-256: b622fe417d275aeb1de4f9434049c7d961ef6cea45b4b01c7cbff1a53ffe89df
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are common for malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hanhthien.net/uploads/file/46394097013.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2og8okjmle5rrip3p8m1vi4nsh/gikovosew.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/b9mivq26b3l7inu22jbduhbq77/supidabonipulisutepebab.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608dddf84e3e7---beridekiwid.pdf
    • http://bephoangdung.vn/uploads/ckfinder/files/39067839450.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908747eb10b---dexewugizowedigifafaguni.pdf
    • http://sibaco.ru/ckfinder/userfiles/files/kurivasonubowelujumewo.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92bc65ccc0---fegemimerakoxer.pdf
    • http://jyjwqj.com/uploadfile/file///2021061720311847.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1384cd5e64---16074111038.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16080f166a27e2---46199146933.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c37ff19899---mopizuratusebexaguwi.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/c3b453d58734eda95c15986a68fa7837/zukobaliganabuvub.pdf
    • https://ecoretras.com/file/15030405919.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d146108128---36327760856.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/57218b271c3395e9e0eeaa828dcc6a09/fovikuwudolijogejojefur.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/850b430103c4fc9628dc3d008694dd39/32438429150.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/87102b31425489c25d3a7fcdf617e487/5061688916.pdf
    • http://alnadaoil.com/userfiles/file/zeveligibibedulevome.pdf
    • http://donghocasiochinhhang.net/uploads/userfiles/file/66962589273.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/p391octo1gdm60i9m1l5phjb8m/vepewupejuw.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a2h50rff782ppmi4i8j39c6935/wotelirubuzonofov.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608886c8570a7---tilexokuxema.pdf
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/36234261913.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=additional+mathematics+past+papers+and+answers
    • 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_off0000eed1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 16792 bytes
font_01_sfnt_off000106e8.bin
8046c376a9a03a9bd0f0544ef63ca0855145361f69168789a091a9c4d1d6a71e
pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 10848 bytes
font_02_sfnt_off00011fc2.bin
466c7f7d14d0ec5575812b4a3f697ad7fb4bf872d1eb61fc0534cf61323e153c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 16836 bytes