Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb1b18e9abcd721…

MALICIOUS

PDF

70.1 KB Created: 2021-08-05 20:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07058cf27709aeab8588b1944d83c353 SHA-1: 7cdddcc50083cd956f1e60379572ef075b0ed386 SHA-256: 3cb1b18e9abcd7211cc3613cf798e17054cbc5da952edd9d75b8c2db7f242e87
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous links to external PDFs hosted on compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1992a03dc1---varukakijemewi.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/acfb435117c63907f31ba2ea7a44d3f5/wulirobotifasaxuxu.pdf
    • http://gardatrans.com/content/Files/kutuwojurimasigasumipukud.pdf
    • http://e-photo.lv/ckfinder/userfiles/files/pekaxavosuxaz.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/3a8b9b76ff3a1a1202eeef78c4d0afc3/75605075677.pdf
    • https://planet-for-events.de/userfiles/file/mameme.pdf
    • http://medrea.ru/upload/files/18954789441.pdf
    • http://crm333.com/documentos/file/javawexu.pdf
    • http://wawabed.pl/uploads/userfiles/file/20809182192.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/14a045ce7ff479e175c28c7755bf2a34/21404628822.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d119fcf5d681633ec71a0e58c4e92823/85470221862.pdf
    • http://fautographie.org/images/userfiles/files/bupuzuxipejivawavulo.pdf
    • https://weeb.nu/userfiles/file/75776370636.pdf
    • http://haiphongcontest.com/images/files/96367291432.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161083ed56fbf0---44269654723.pdf
    • http://bursaceyizgelinlik.com/images_upload/files/dubolidowufola.pdf
    • http://gabinetortodontyczny.eu/userfiles/file/gizuravikumivamelame.pdf
    • http://c2r-auto.com/uploadfiles/file/2021071304532373499.pdf
    • http://jrpst.pl/userfiles/file/watoxixosetukezurem.pdf
    • https://tuvanthietke13-5.com/webroot/img/files/xovelodapi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sketchup+2015+free+download+with+crack+64+bit
    • 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_off0000b034.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB034 16792 bytes
font_01_sfnt_off0000c846.bin
79d46b2182a81c8ab9e0279d2838f98210ef5b50f8a639c3f82098f785632b6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC846 15056 bytes
font_02_sfnt_off0000eeee.bin
b82dd899fd85f005ea1843225a50a1cf8567ee77bb159579eecc7e3d2b34f36f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 11716 bytes