Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cba32d7862c631d…

MALICIOUS

PDF

79.5 KB Created: 2021-09-02 23:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: df75280f1a75d9703b6fd9977bedfabb SHA-1: 22d52ca18c0e89e28128b7e3d976c9f38af09392 SHA-256: 6cba32d7862c631de1bd64d08683618817ccf2651c1191e63054da4159946907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://myappartement.de/web/editor/files/tokozelosi.pdf In PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a29d0d8633e33b558f82e0dddf342f62/xamoja.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/68779027413.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/5f0c4f10e6f279366713f674fb2407a4/tebadebijamiverezusunu.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/80928461763.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/vekidexaturapixora.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/18512126186.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f09cefb6---44114116388.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04ba08eee3---59376604162.pdfIn PDF document text
    • http://firegallery.ru/img/upload/zogezu.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/komotuxuwiwi.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/idexem.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ddad2e1a05---1793531246.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/434488980b895ad71a8be2afd573e158/59603431715.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/11920959564.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f1de66657---gosidefepija.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/63354454322.pdfIn PDF document text
    • http://toroisg.com/public/images/files/11881563259.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2d8c88cbdfb7461aae3579553b9d5830/86126173201.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef87f88ea9---detumemepu.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/75088517398.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16071c22ea7f6c---gaxanozosiwa.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pafuremejipafafo.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/80837131089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=doing+quantitative+research+in+the+social+sciences+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_off0000d207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 17124 bytes
SHA-256: 586312e7fbdfc876fa057ee3c6b9b184a8e603c2791ff6842ca35f590b3c6241
font_01_sfnt_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 11212 bytes
SHA-256: 4bb0c88dc7d41e683b7fdd47a808e924ddb7eb75aa6d525933c6c2889f3bdc50
font_02_sfnt_off000117fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1