Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8f07c0334dfa5a…

MALICIOUS

PDF

76.2 KB Created: 2021-08-06 17:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 06e0fc635c176dba1d6cf01024f9b393 SHA-1: 82c8f67998e290070936f26a36deac8729979d9b SHA-256: 0f8f07c0334dfa5aa7ea80ff1e6035670928bf6db32df337017ac2069a35c04c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b33e95f59---nopoxiwatuw.pdf In PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a58a9a6a9b5---96427690280.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/kugolomijim.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/gikixegadugevowinoriwe.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce806029f8---wawejazapaven.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/fegitiwaraxafumuva.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/d284d6098290162e44e5271d8369a88a/vodilebaluzalo.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076938e084a4---3969640691.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16100b9b5a9936---nagovafilupisaxifigozug.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ka6otff15mffk4sv6jb1vksmdq/rowifufuj.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a6092d9da---dafoxa.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/bc10e91b0a267148e4aef5621f7b5a12/jorenu.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/sesokanejebevun.pdfIn PDF document text
    • http://yejida.com/userfiles/file/xujewemopixejazi.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/71865885908.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/euukof1n64bkin4rsjbvdmsave/25371646189.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a71f9f91d20---tupivivudebubaguvotubej.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/kugadutejobizifoban.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e6d09372b85d3219ec9a60ccded0086b/72835699667.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/93043668697.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/potufenil.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ec6111510ba34c5313c9db01a14d4949/60738632493.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/vosodapik.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/abcf2d1174a30cd0879a2bd2f2f52749/jefifibiwino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+is+kancan+jeansPDF 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_off0000c5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A0 10276 bytes
SHA-256: 9e8f541bd3097af036fe8d2156859a440c63f8729be477c3ec7614e0c99872ea
font_01_sfnt_off0000dcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 17108 bytes
SHA-256: bb97b426aec7d978af43f9248b16d5e1a67669c222dac7823f74e7be85a49ba9
font_02_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1