Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cb03acb0cc5734…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 16:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e2e1057f26de1e24c0f07d57d6f0031 SHA-1: 650452b0e104eb96f3baac724fdf2bb66897968e SHA-256: 35cb03acb0cc57349128121cc89e6b8d569c1c64f6d2602b8055fda9700cfbac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, forming a link farm. The primary purpose appears to be redirecting users to malicious or phishing content, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4941c2d0---16028656885.pdf In PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210909_5B9E8BAFFC3E67B6.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/94830062091.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd445174a5---dulaxezakajolike.pdfIn PDF document text
    • http://runhouchem.com/upload/files/powunekonafigutaval.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/20050646944.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5036ce7f7---13302095640.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/jafaba.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/95467057237.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/dewufakureguso.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/zenisivivuritefogilotaro.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/pajisokalo.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/fbd460c4654765d5a75effaa482fae7e/gufefo.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/20762187933.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/48173530466.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/wilozamarotenej.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/2640790314.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/62927933199.pdfIn PDF document text
    • http://ausafe.net/images/art/files/10557783268.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/rirabuk.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/soriwadixokej.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/69396468578.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/guxusifijurasijitej.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ed1e1c42ff7374ff0dbac4eed7fb81e6/12844782085.pdfIn PDF document text
    • http://tano-cable.com/d/files/vopupizemuga.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021091017514373499.pdfIn PDF document text
    • http://wohingltd.com/userfiles/85756062475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=remote+call+recorder+app+downloadPDF 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_off0000e4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 10544 bytes
SHA-256: 0ffa26bdadb2c0fdf4b3658a6e14fb16f93b3f5a4a2d8570cd34144ef016d61d
font_01_sfnt_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 17012 bytes
SHA-256: 323ba8b8d3a903dd9afc3d25c88d3d57962e13bac80a0bc7e104b933b6a4a1fa
font_02_sfnt_off00012978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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