Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c339eb75ded339b…

MALICIOUS

PDF

73.3 KB Created: 2021-09-12 08:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 679b1f62230ec94779d463e0fe38a7aa SHA-1: 9948b46e5c08fb8dd4d39a49206088b203ce1471 SHA-256: 1c339eb75ded339bbab8d3cc409db2487012329d7506e2ac6d0641aa01b7ade4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous links, including those with UTM parameters, suggests an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://edeins.com/userfiles/file/vemozojuvusobapagi.pdf
    • https://etcbt.com/userfiles/file/zubunodago.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff16b9355e---gizilezifig.pdf
    • http://veoguidecostarica.com/ci/userfiles/files/marugujixidim.pdf
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/80197692608.pdf
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/derarubovafadafigil.pdf
    • http://parentini.it/userfiles/files/selopap.pdf
    • http://cecev.com/stockages/files/36220682474.pdf
    • https://penmypoem.com/new/admin/uploadfiles/file/41540000364.pdf
    • http://hmondo.com/userData/board/file/79870103394.pdf
    • https://www.comperat-89.fr/ckfinder/userfiles/files/sivewenowobik.pdf
    • http://solyaris.pro/admin/ckfinder/userfiles/files/nedozu.pdf
    • https://spacio.hk/attachment/file/zimuvonabofupunoba.pdf
    • http://cu-hinothai.com/ckfinder/userfiles/files/femugabikezisegederogixur.pdf
    • http://alianzablue.com/aym_image/files/9766068814.pdf
    • http://sanarina-coaching.de/ckfinder/userfiles/files/vivatiwamovonuwuner.pdf
    • https://citronel.com/userfiles/files/jopenuvenivuvujalugasog.pdf
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/xesudubusagowor.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/dknvakjfkdrldmd9vea5j3gvoj/soxosufaropanotavawizoj.pdf
    • http://turksebruiloften.nl/userfiles/file/remofi.pdf
    • https://wolfgang-photography.com/userfiles/files/toruvibod.pdf
    • https://pnlcoach.com/misc2/file/
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd4411fc1---15557586533.pdf
    • http://cableesmaltado.com/d/files/4946973652.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+find+private+number+on+android
    • 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_off0000bd64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD64 16792 bytes
font_01_sfnt_off0000d57b.bin
90ea1ef784ba1efd69d002994c08befde82fb5a109a6242f782512f09f6102c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD57B 10828 bytes
font_02_sfnt_off0000ee32.bin
3d86c77a43da4477b6f692f3fab8918c1f60704522fae95ed94590020290c731
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 16148 bytes