Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fab79df265b9c9…

MALICIOUS

PDF

72.9 KB Created: 2021-07-27 23:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8386b8013c0e49f968ba4c12efdbbd43 SHA-1: 1c0ddda86ba67ba50c7ef690ddd2ef8366dacb46 SHA-256: 31fab79df265b9c9366827d039079cc3cde769c29c74937a70b0608f27abec75
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure and link farm behavior are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/eo7p08t34devjtlf7d173uut48/nawapigirejivelunijexiv.pdf In PDF document text
    • https://peterdegendt.be/file/tizinovuzew.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac593fcbbe2---91992078204.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089aff8e4f04---40101971901.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/zefuka.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/cn56b7oaio8efqd4stvnkj08h4/63877411241.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/94178178969.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/digini.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021052003555273499.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/lijawarozizetanixobixe.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/40399733542.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/79038797356.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96648431346.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e054169f2---vepupojikutobat.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ota1pr640rd0ifnl05j95ohqcl/92439080074.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a280049e3a---jebux.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/54856434605.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ac139a3cb---kovagifijezax.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/silofu.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/riwurerex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+hypnose+malagasyPDF link annotation
    • 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_off0000b9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E2 10772 bytes
SHA-256: 0be59f8941d963cad7c6eb3ef75234c24a91683f8e6efd7d0c6388512c51d042
font_01_sfnt_off0000d242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD242 17064 bytes
SHA-256: 12d1e80636c11c2d66a7ea8a21a640a2bcd464cab1e99d23ee9cf450b397697d
font_02_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1