Malicious PDF — malware analysis report

Static analysis result for SHA-256 92efc9274c55cd33…

MALICIOUS

PDF

74.6 KB Created: 2021-06-25 22:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 077efd20dc2b07c15b51be4ee610aac4 SHA-1: 7ceb02ab22e12210d99a43c0a598a92b0736ae02 SHA-256: 92efc9274c55cd331ff82f1df812202ecd529c89c5f06e302e20118aba581dfe
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, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings are sufficient to determine its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/lpfuagr22gmdn3g2th4l8uis8t/16525053916.pdf
    • https://hasekei.jp/userfiles/file/84761055346.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1003667ea4c49202f4c8e8c312f67aab/penulorizonugupitirod.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/rb6216fhat8dda1pek0nndcc7h/79610877815.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1fa043287---tebonuta.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/87130dbed5ba63fe2f63841e06a84d10/42568633566.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/7o15jr16ss2mt5mlrrpvsrv9iq/90598879198.pdf
    • http://beloezoloto.ru/userfiles/file/79576691198.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081c1eb1ee21---72731210810.pdf
    • http://aldo-ins.com/userfiles/file/zozukibodag.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105030149078160.pdf
    • http://arohitourandtravels.com/userfiles/file/61774868701.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a174575770a---kuruwujumoju.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/9d8d523c8b3d989d81ce55676bcd15f5/dipetegozurupuf.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/91802bed170ca2d1417c105ab104c095/74428930321.pdf
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/7a2f965dc4181b43685d99b7724fafb1/88592849441.pdf
    • http://minerva-collection.net/files/files/81024823776.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a9535be4eb0---nemiza.pdf
    • http://auksozvynas.lt/userfiles/file/9463805852.pdf
    • http://www.bandungmesin.com/file/renidasofukagopawame.pdf
    • http://grawerlik.pl/userfiles/file/fotadujidulolijinutujaw.pdf
    • http://syuncyoku.jp/upload/file/35299037164.pdf
    • https://kopari.hu/files/file/11567586292.pdf
    • http://boekenwinkelindex.nl/images/uploads/67192289496.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160caf5fc8da1d---mafojawinas.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/c13471d730bb44baa3ffee79e22cf60e/86994027373.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/7167e595517a02078132d348aa5ae591/fikuzomibelif.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bed+bath+and+more+suriname
    • 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_off0000bfc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC4 16792 bytes
font_01_sfnt_off0000d7d6.bin
ec2e5ae57b3b2b02ac2d11e5827202b619527f7aae1bf96a2a1c3f2ffe617fd7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 17208 bytes
font_02_sfnt_off0001047a.bin
5f18b47e53b99413c0bef57bd23babc063a46abb20bbc2d68300dd701e4c3d8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 10760 bytes