Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8a3e06df706dfa…

MALICIOUS

PDF

91.0 KB Created: 2021-06-27 02:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7342eaa266f30ae2fb55bc0626821dee SHA-1: d33ffa2115e16482dc8ea70ab9f44a91999643c5 SHA-256: 4b8a3e06df706dfaaf2d9e2b226c32839f99c154928ade594853be8d0484fa58
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress sites, with multiple distinct hosts and disposable hosting patterns. The embedded URLs likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/663f19a4e1b3a3c4ce98e1f135b66687/petulexixemixufivalu.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd59d69257a---69051846093.pdf
    • http://atenngo.com/admin/sites/site/documents/xuwejimosurudu.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607773e8ddd07---biwaxade.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d06aebe7bf1942df65b93af14497a34d/kamogaxejaxom.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/66f0bc2f9e38edcbf552f83ed4b0ca75/81284154837.pdf
    • https://thefencedocumentary.com/adminfiles/file/97858799071.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a8c6bfae8af524c9402d8f8c5ba7d4c2/lizuluxoxe.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/ligifuvovireterav.pdf
    • http://files.ibiza-ferien.de/file/lovudefixerutitedo.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/28e975b4cfe4260d21bea6645bb98d35/rilunekomid.pdf
    • http://hysansam.com/fckeditor/userfiles/image/jajedoxopopebonudef.pdf
    • https://bio-obst-und-gemuese.de/userfiles/file/65058598727.pdf
    • http://lamachine.nl/userfiles/file/65859834588.pdf
    • http://bogelaipigeon.com/upload/file/viliwesi.pdf
    • http://eperon-kochersberg.com/img_db/xagebem.pdf
    • http://learnersdigest.org/userfiles/file/4797809213.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e028895fa---mixupugaxisidapo.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/eee39vp409rv3g1qb98if0s627/mewuxuvana.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d68d0e5b---mulazajemuvorobuw.pdf
    • https://fanaf.com/article_ressources/file/wivoxod.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/60uakvmmc7ghns50r1rbe9ccg5/wumonasemutojumotelijo.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e63bf7ee57abf642749a8c6b0828bd34/41408693026.pdf
    • http://escqatar.com/uploads/userfiles/file/file/25905725711.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f2b3a07a1dcad4665799d1690bb7b6f1/vebejuzorevuwomafobi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=3+bedroom+one+storey+house+plans
    • 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_off0000fd45.bin
b83497f438372b8c0447ba5c0a38e2427dfb39945bb69dd46fdc97a5f53902fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD45 17640 bytes
font_01_sfnt_off00012bcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCC 16792 bytes
font_02_sfnt_off000143e3.bin
494ce4bb9f1f8dac7a102d760ffb13944313a050298447e01ce9b7cb3aaaa1e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x143E3 10996 bytes