Malicious PDF — malware analysis report

Static analysis result for SHA-256 55033748a0765a3c…

MALICIOUS

PDF

88.4 KB Created: 2021-07-10 05:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3c2f3244be70e724585e37e4570a1495 SHA-1: 3f2080c35c130b98d051da939883a288c8f757f8 SHA-256: 55033748a0765a3c58b6e6286a7f6c8441ad7d1ca7d6d693e3a87baae3857689
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the heuristics indicate a focus on external URI redirection and link farming, likely to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/24c550620235ab5eb216b347a395790f/kekakesevorutupomunexifa.pdf In PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160932f76494f8---88710824176.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/0kjhsvsvuc2b11t5u7nem28h10/12112054149.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/fa1b0100030e1d4ae3d012463436d326/4463481305.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b5faf015db9415b74f41fb7d23ec2aa5/69839026281.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/45436649853.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/98725252539.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/43272458274.pdfIn PDF document text
    • http://limoride.net/gallery/file/rinabad.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/dixagozafosojitu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c76a21015---58523428908.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/92387399553.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/5015943888.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e264112049969e8e8fe19e1e34d5a1c2/39215362004.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/54488545220.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1288322170---39146656041.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a79964a9345---59365343388.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bb70035ad---18333479701.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/66078854233.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d1d90e06104185033dcad7402c1701ea/rumowefekeboxajo.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d248785603eb35eb5e0dc6b53f8d61da/kixelowuzukizax.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082c5dc88a3c---98360653193.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/59kq2niiv0ko66h2p80gfop32o/97540575502.pdfIn PDF document text
    • https://daismene.it/file/nopebakilarimaguwor.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accd4c78371---98005924515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=practical+handbook+of+soybean+processing+and+utilization+pdfPDF 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_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 16396 bytes
SHA-256: 0ac1cdc4af57a5272f318cf990710fb981f51c5eb3ef2d2d7e7d341ab3c1e13f
font_01_sfnt_off00012121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 11404 bytes
SHA-256: 1e8ca7c9cd41a7ea1655e6e0f9ad4e8b56c5c5e6baee431e2f04950488c96488
font_02_sfnt_off00013b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1