Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fddeab5f44fb11…

MALICIOUS

PDF

97.6 KB Created: 2021-07-25 05:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: dd78e49a5ad1d58c4b57194e2521e83b SHA-1: 21c8e97187869b7fe9eeace15fd11cec0aba42d5 SHA-256: 13fddeab5f44fb11c030af19b7e76e43ede7b402ec8f61588349dd12ce68ea36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous PDFs hosted on compromised WordPress sites, a common tactic for distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs suggest a multi-stage attack where this PDF serves as a lure to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160775da2a7b40---33502252211.pdf In PDF document text
    • http://meble-tk.pl/userfiles/file/17156140986.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/93084767411.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/dfd643a23092403cc4f117324f209131/dowomovusog.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/odms4jlq4br7c4nvuf9dutfe1a/49333722902.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3526d55f42c239b4591064b806e9d009/loputolazewelepukaki.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f89b12245e3---86898621768.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/tee4ce7a71a6fsu62lrv8tumo8/dugometupireti.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ae24bdfd2---92528179314.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c11cf219baf---muruxaziw.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/4383965405.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e3daef1cac0dc688f817e31b21c2b683/22229479698.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/ca6805064954cbc7b75df05a271bf3f0/fenukaloputojonepipa.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/1505767250.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/wiziz.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/53154dd17630f0c0d6d6602ab4a94ac4/vurirodasi.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b18bb3d5c---75428736089.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076051d03fda---sivijibo.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/2092a30a1af05cc22e9982a719259add/pirubu.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/mumes.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/99824492121.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/8139730014.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/ed9feb9d2001d384bf884ef53742958f/tefofidulufakokenero.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/11724322839.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/tvf7beslvgik4jns8r9f0doahb/bikokepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+calculate+atomic+radiusPDF 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_off000118a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A5 10604 bytes
SHA-256: 205f12924df1db245f6b7e020c6b4a4f5ceef922f08d5e7fc505535b73322e58
font_01_sfnt_off000130ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FC 18156 bytes
SHA-256: 1bc60072c9a1fc5dfef4bf3cba1cde5278bc80ac3a2cd193524272aaf7e384c4