Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa29e29efcba1bfd…

MALICIOUS

PDF

76.1 KB Created: 2021-09-13 17:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8209b13697038b131ccd8b3e724fc7b3 SHA-1: 77c1784f0a5a9711abd964259ddf1f12229ccefe SHA-256: aa29e29efcba1bfdd667c4ad4b3481564d59b092dabc3e047ba83d5a22d8be12
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

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 http://drprdesaihospital.com/uploads/mananikozobu.pdf
    • http://3mfa.com/images/editor/files/8857421579.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/86dh4mftapf26lo4ckhv77vvth/jivadugikozenuguwegud.pdf
    • https://hoatuoi360.vn/uploads/files/nibikutasiledupux.pdf
    • http://contua.org/userfiles/file/85212473732.pdf
    • https://songhong.info/userfiles/file/xozujujasilofeli.pdf
    • http://eqletstalk.com/uploads/files/202109011624102038.pdf
    • http://chono.mn/uploads/userfiles/files/tosositulovude.pdf
    • http://urgentcarepb.net/userfiles/file/lobumixu.pdf
    • http://dongzzang.com/userfiles/file///63080197362.pdf
    • http://ddservice-bmw.pl/userfiles/file/30277543097.pdf
    • https://gemwares.com/userfiles/file/foduselegadobabivu.pdf
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/vumidisowudab.pdf
    • https://magicdiscoradio.hu/userfiles/file/sofupiwifoma.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/92tebalg2g4revssoqpgil6036/95159188128.pdf
    • http://tiwtactic.com/userfiles/files/remusixizivasasamikakabej.pdf
    • https://dcimx.com/files/91516091605.pdf
    • http://floridare.ru/app/webroot/img/uploads/file/191810_mibajokipixekobef.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/49933c7316630679d919b325ed4cc1e7/3187636260.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff7db5394e---79538127279.pdf
    • https://extremedriveline.com/ckfinder/userfiles/files/43427879634.pdf
    • http://belovosushi.ru/files/lafixuwiduvab.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff50c40e8e---41377840080.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16133123835ad2---pewosijowagusobupigafage.pdf
    • http://hoachathoanggia.com/userfiles/file/xizorekelekew.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/11d34c795eae7d1c850c7eaaeca84892/84793318495.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0d2c7e34d8f4712a9af6f0d5fc9eaf5d/91128617406.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+iii+lite
    • 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_off0000c7d0.bin
8bb3508ae9257da85eea6898a8f1d3386224151c986e820768caea3050dcaf44
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 18196 bytes
font_01_sfnt_off0000f62b.bin
34bf71d1ea7a50c0a7d147d47463c1ecb0d9e6ca9521958ac6ec8f61ae437bf9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 9648 bytes
font_02_sfnt_off00010b36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B36 16792 bytes