Malicious PDF — malware analysis report

Static analysis result for SHA-256 af35341f200aaf6a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 00:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ae02ee15b688d12c971189e6e9af825 SHA-1: 4595b59d564245fd74c36a2670af8be5e49b6ee7 SHA-256: af35341f200aaf6ac446c25c3e625f14c4b30cad76a737806cf4b5f48ea0012c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.passion-rnd.com/upfile/files/2021/06/30/gavenotopaduzigabazudevo.pdf
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/6937205567.pdf
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/kusilafopalab.pdf
    • https://oykufestivali.com/ckfinder/userfiles/files/54359672283.pdf
    • https://happycolaborativo.com/uploads/files/nuguzuni.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160bba10c085ee---dudojawotedaxesuvep.pdf
    • https://mgogs.com/mgfiles/file/53118621544.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/nepinoniv.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f83b2449c---jelidutuguwaxorana.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16079765b77f9e---falinozosujip.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/a4ehv20a6nth7tn51dr9m28dq2/panubos.pdf
    • http://firmen-bekleidung.at/userfiles/file/nivip.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8740d1ffe---wotezamuwop.pdf
    • https://smsenerji.com/resimler/files/3324816126.pdf
    • http://etasystem.net/userfiles/files/10106593604.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077016824852---xojopuxivejosotexolob.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/dixuruputaxawi.pdf
    • http://afgventuregroup.com/cfiles/file/jufupipuguminig.pdf
    • http://zzliuxue.com/upfile/file///rexojupamipazurijo.pdf
    • https://nichecnk.leaddeehub.com/userfiles/files/10740092841.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611ee6650c8bc---85992496416.pdf
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/21688152351.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=soal+koordinat+kartesius+kelas+8+pdf
    • 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_off0000dcf1.bin
0dcef5ac9852185aa0b00d56d090df840f415a8bd864753e7daffc517fa2fc7d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 10968 bytes
font_01_sfnt_off0000f671.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF671 16792 bytes
font_02_sfnt_off00010e83.bin
1e18f0f788193a2c701bbe3569553472df3e97e499a62763ecd699a5ef890e49
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 17268 bytes