Malicious PDF — malware analysis report

Static analysis result for SHA-256 7361c2b23454d2e2…

MALICIOUS

PDF

76.7 KB Created: 2021-09-11 15:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a792e94e3c4555e8358aaa698b24aa60 SHA-1: 3506faf17d6d54c9d3ef2aaa3d11c458ae8d21b3 SHA-256: 7361c2b23454d2e21c35524a1268aebb51f013acdfc98793c8e394685b76d9b1
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, with several pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=pokemon+ruby+mirage+island+cheat
    • http://ugyvednok.hu/userfiles/file/67208807134.pdf
    • https://pt2-turbo-j3t.com/contents/files/54981016059.pdf
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/12296784843.pdf
    • http://jubileejec.com/userfiles/files/28776258077.pdf
    • http://beiwendq.com/userfiles/file/79334683218.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/a5ef1a5b045d8e39774e23d93228f4dc/mufisupexa.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/294357c265f48487348ae3c680688942/46152957522.pdf
    • https://tatvan.in/userfiles/file/zeziwumojegoxe.pdf
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/radusifiro.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/21968453136.pdf
    • https://leresto-niort.fr/images/userfiles/files/lanisozapinedo.pdf
    • http://techcessgroups.com/userfiles/file/30887758240.pdf
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/33959671643.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131596d74b0a---vizoxikip.pdf
    • http://autosvilar.com/uploads/ckfinder/files/luwabijo.pdf
    • http://robbes.nl/media/files/pemin.pdf
    • http://fantacyhandicraft.com/userfiles/file/kifuxe.pdf
    • https://doan295doson.vn/namthuan/images/news/files/botad.pdf
    • http://www.sm.ac.th/ckfinder/userfiles/files/zozipinabisudobem.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/afa0ct43djjhv2udvtop3vq6v0/siziropusoxirixudis.pdf
    • http://ausafe.net/images/art/files/kujeposigijerexogitapu.pdf
    • https://netpage.info/userfiles/file/gagojib.pdf
    • https://raguvosbaldai.manovonia.lt/images/files/gejenomewefa.pdf
    • http://tsuiteru66.com/userfiles/file/vevolaxusagapu.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_off0000c404.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC404 16792 bytes
font_01_sfnt_off0000dc16.bin
5557f52d19ed6e9f416916dde6969ffe2092e30522e76d7b5a2491ebb677827f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 17492 bytes
font_02_sfnt_off00010925.bin
5104f9fa225da34cefa31903b2dfb873c5a35e3bb61b341738b505177f9f6eb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10925 11264 bytes