Malicious PDF — malware analysis report

Static analysis result for SHA-256 2153c283f4595c02…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 07:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 279117213783585bdb0a387b90b9154a SHA-1: 05d79f880f6087cd737fed495a547531b6abbb38 SHA-256: 2153c283f4595c02680c12544d6b1e3cd2f071f21d6380c34aaf3c7a8a642cbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest it's delivered via a phishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145442f8aa57---fuzeledejipenu.pdf
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/xutozokixagogivonaj.pdf
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/fuwudewobezotedonolofa.pdf
    • https://www.abandassociates.com/ckfinder/userfiles/files/mekegokiwedim.pdf
    • http://e-hematologica.com/users/file/jizepepo.pdf
    • http://yoron.net/up/files/lewiwagekupenasisolimur.pdf
    • http://baugeraeteverleih.de/benutzerdateien/99436594648.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/fofimofofolituxuladiral.pdf
    • http://icaalliance.org/filespath/files/20210914100747.pdf
    • http://prabashproperties.com/ckfinder/userfiles/files/wufagewozufebamez.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a3eba012---89375729099.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/minilizosirowi.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614096e028444---didikudamiwatiwop.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/6jd1nka44of5jjpn4o8gf6j745/30677476375.pdf
    • http://asiancfea.org/userfiles/file/59227446370.pdf
    • http://studionegrelli.it/userfiles/files/webuzuxivoxinisusesenafim.pdf
    • http://whitedwarf.ru/public/images/ckfinder/files/juzulelikefajizanovib.pdf
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/35698674997.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462c88c5d5f---29896033926.pdf
    • http://amexeuro.com/an3_Uploads/file/pipupedateleg.pdf
    • http://www.eatvirukai.lt/uploads/files/86465916316.pdf
    • http://qkmedica.com/uploads/userfiles/file/tizelow.pdf
    • http://www.mezmat.ru/ckfinder/userfiles/files/vamaxepib.pdf
    • https://mmeasar.com/mmeasarfiles/file/80048882297.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138b4f91a185---4030674523.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135d73f639cf---zupenun.pdf
    • http://gourmethousemacau.com/UploadFilesfile///wujiviriwagefo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+imageview+zoom+in+zoom+out+animation
    • 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_off0000d216.bin
0fe9cb580a436cba3efd2bfcbf2b347f704e8b66ea9880a3d0e1be99d2c16d97
pdf-font-stream PDF embedded font (sfnt) at offset 0xD216 17632 bytes
font_01_sfnt_off00010004.bin
5ad082d076a5de09669933d242610843b0f44a558d04fe60f9eefcc9cb6d142f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 10668 bytes
font_02_sfnt_off00011855.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11855 16792 bytes