Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43cb053ccc0b45e…

MALICIOUS

PDF

83.7 KB Created: 2021-07-18 04:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6be2a773895313b58f4c10fad2136fc7 SHA-1: 86285f7dfaa619976c50cefbfa065705aceae69c SHA-256: c43cb053ccc0b45ef41e467b3471f117b999a9329437072a314c069a34fe885b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, likely to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7e0fccd88---kafotitodemanesadapeb.pdf
    • https://destockbaby.com/ckfinder/userfiles/files/kobitipoladefifisiwakoxu.pdf
    • https://habibitours.com/ckfinder/userfiles/files/javim.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094281c4ae3b---govorumafaduretibubogu.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/bk66kjn9jo5p01gprpe2ncd0bm/40630887128.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/34303556649.pdf
    • http://amadpich.com/userfiles/file/foget.pdf
    • http://mylodge-naoshima.com/79455294744.pdf
    • https://ludifrance.fr/userfiles/file/63905155555.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/05937a65603b0a737cbcb030351e7faf/35258470376.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be7d70dee62---gerogepidilixuxi.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/funinefakoxidim.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/xutalepumigisavovamovut.pdf
    • https://powermailer.in/userfiles/file/nonutefepomu.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/q1j7ij865ddtnidb1s1bhl0bh7/peminobatulegikasigusili.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/517fd0d2a18b945d73c0775dc738f69e/86731883030.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a837496c0e---70352834435.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4037404ea131bc8c132051bf98fef7d3/zizanapo.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/24897429732.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/gkpcsf8ufg0i1rqmem2q3r4341/bemejasu.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2cafd669d86abdca0582cf9683564a50/nomufusofeviju.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6ecbce238---degomomitolix.pdf
    • http://thebrownbag.vn/upload/files/2949138279.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bd4abf7a5---59876683534.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gk+gk+question+answer
    • 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_off0000e205.bin
5126d69b05db5aa10022c0b8e1b35605ce68c011bebcdd3dee97fd6b7303100b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 17032 bytes
font_01_sfnt_off00010e6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 16792 bytes
font_02_sfnt_off00012685.bin
425318f8328d2337119f968696cb8a9bc924253c741ec9786a74ceb2befada87
pdf-font-stream PDF embedded font (sfnt) at offset 0x12685 10700 bytes