Malicious PDF — malware analysis report

Static analysis result for SHA-256 738f1dfa488a2ca6…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 00:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: de4787499ad58979b24a29979ed42e51 SHA-1: 2ee3d9e5e85efd7005f746cc802bc698e2096789 SHA-256: 738f1dfa488a2ca6f769e06eb25805ecf720689b669d3621e109b9632a4c7c15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The document's structure and the presence of these links indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cructi.ru/uplcv?utm_term=manual+de+practicas+de+laboratorio+de+bioquimica+clinica PDF link annotation
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff9e29a67---62434755190.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/80436806157.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b868e93a69---pumukisuwiwamuvadejes.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850364aaf4e---2183135054.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/jolaposegofetafoxerumasa.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4462813b3e---73109957599.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/749ca9eb984cd3039a562cbe6bec0f24/66317868362.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lutipovoxasadigakitemun.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/favosidodola.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/nedovotedowefab.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/vemigodokavodufojij.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/99014724624.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/jetaziwovakixisurir.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/90377393500.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/90145843386.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/dasifivebed.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/kefixilanisofaviguzero.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/favarex.pdfIn PDF document text
    • http://stroi-sistema.ru/img/kupekogusupexe.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/1616441777.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/afh98neod46t2nb6vms627p4f1/fotujiloputaforebo.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/foqivklchahdbrb4tokkv4ar42/21572889599.pdfIn PDF document text
    • 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_off0000c42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 18700 bytes
SHA-256: 402b9456a80edfd3517a056aa19eae16a9dfd079c244b8d80306ab522de7031b
font_02_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 11052 bytes
SHA-256: 6c7f7bb92ac144aeedeb561972da33e69b0b27006246497724d0a1ce9591013a

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