Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbc3beb952be2d5…

MALICIOUS

PDF

87.5 KB Created: 2021-09-07 10:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79d8030e5f708db62d406c65dcf6c8f8 SHA-1: ebbca62feb55142662ada900acf70ed290d63f9f SHA-256: 8dbc3beb952be2d5805f6f7f72dedcc7be268e59541bfe46f9e2be4ae177cb6d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ppuhperspektywa.pl/files/edytor/file/sagikajeladez.pdf In PDF document text
    • https://wheelmartthailand.com/image/upload/File/nomexirofobame.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/49382250051.pdfIn PDF document text
    • https://somogyplusz.hu/files/85919499137.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/1172867901.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/zojiserozevemiwem.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/sezuvideragogar.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/witubozefiwejuwe.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/punularasatamokazela.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/80229015944.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7270106fb---69657245636.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/vobodejageleb.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160db8ed5bbea3---28977390774.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dd2eb6521---xeparazetavexofudaten.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/3120b2c4cbcc3dc51035824c59e1c556/46773531756.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/433d3699f0260177f24b721903d18b0c/90774809201.pdfIn PDF document text
    • http://446888.top/userfiles/file/83321765125.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c656a95d563---63567238121.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/memunagadipazififot.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/kogerew.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/84473380202.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/28422741745.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/51197063364.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/72189368556.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcefd3bb92---99984818477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bd+police+job+circular+2019+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_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 18568 bytes
SHA-256: f36c9cb0a79cbe72b031e06dd927a82f1f0389c52d21a7762fd7276737afe9a2
font_01_sfnt_off00011dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFC 11128 bytes
SHA-256: 140606dc8aa33ce56dcfc4995a9f754efeb6b36f3c0766aa52e2591a6b791eac
font_02_sfnt_off000137dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1