Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7984dd2969759a6…

MALICIOUS

PDF

103.8 KB Created: 2021-06-27 20:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 25a1b5dc9b931e5fe19af57b392dac3a SHA-1: 596c915f7eaddc1e91564cfee43099e69bf1989e SHA-256: a7984dd2969759a61added0005368fce6bfc39ca594a01da922c2e379b4b4db7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve as lures to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d134cb568b2e9990097ff460ac8c4b76/12699872612.pdf In PDF document text
    • http://cleangroupbd.com/ck/upload/files/kigewisu.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/lakavijopoziwapugavif.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a5085388dd2---18455950700.pdfIn PDF document text
    • https://unosms.us/userfiles/file/75937360889.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/8da03f4cbffb821cf8750223544aa11f/womilesutiwogax.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c28b657a3---nusemowaxifexazigofito.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/misameb.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/rd6kkmti7aeaj7pr3bkgl9heep/14736449281.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/msbrf1hahjkffgr4kjaplm3sv7/fexitu.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/49981251429.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210523040958748.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/23q8a55q5j68215jpjeo5jv253/45851426402.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gn0ripjam3tvtrotc139b1ghk4/giked.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/ratozurawepufevewebomos.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/481c571d55681b6c9794902ee2a6fb05/45140537745.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160707e62b29de---gumakoxopakifa.pdfIn PDF document text
    • http://sivam.pl/files/file/nunibe.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f095e3fc3a---lijepa.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/83ec174f565f353403d0267aacf27752/44861569288.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/sixijeri.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc3bb043be---11690264072.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160add3bf5cdc7---66307915829.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ba5dfa37b3d9c1b085289f757a64e928/88913165026.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b6984e80b210dc2de28a6800a313bd9b/bujefofawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dose+meaning+in+bengaliPDF 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_off00013a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A64 15696 bytes
SHA-256: 3e8b48581dc1582ca49e967d532c5d6d89ad95c6dfdcff9571b929c7e343b890
font_01_sfnt_off0001626a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1626A 10392 bytes
SHA-256: d869c68a500033f4c21ac5cacd8158ab054be57fd5c110d34e55dc51dc4e310f
font_02_sfnt_off000179e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1