Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fc346503da28f3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 05:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 11c6bd9f17b1a8f78d3509e6fb2ccec3 SHA-1: 265e0e995aca47af32bdae92b87882af8d8fb884 SHA-256: b2fc346503da28f3a197916e5e3b6d544018df9f240541629d9c6d02224c6d4e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains associated with compromised content management systems or disposable hosting, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML classification as malicious further supports its malicious nature. The primary attack pattern observed is the use of malicious links to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=download+real+driving+3d PDF link annotation
    • https://ceiling.holcom.vn/webroot/img/files/21880884407.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/tareto.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/wemipeporifagizufudifevi.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/62997742154.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/bixewuzer.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/takadedigutazamivago.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ece921e30e---pipozovasiwijiwapudotot.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/58217084354.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/79634883143.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/s7sgb0vbcajaeq2jdkh5j5ajg2/bejipubedoxipul.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/bidafekafidowobamanenifoz.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/75305680685.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed1545e163---62007798929.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/40287487263.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/welomow.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/todexigekemutirazepinuxef.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/82112636313.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/57590211567.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/gavofazuxopurexixejufasa.pdfIn PDF document text
    • https://izr.fr/files/zegeduji.pdfIn PDF document text
    • https://olterus.org/contents/files/lenumelozaseluwur.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/wewijuveku.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/mukexekefabalunol.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 10480 bytes
SHA-256: f58440363190bae15009da3b800404da35d212190f2971c9e44e770385c07766
font_01_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 16932 bytes
SHA-256: 54f64f70fb620528c1db65657be3cea863c318ad83468cb7d5d94a1318a60802
font_02_sfnt_off00012496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1