Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7d566a0fbe54ce…

MALICIOUS

PDF

82.9 KB Created: 2021-09-21 07:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4258d29bec51b458105354d3b00ade25 SHA-1: 1b4540515c7af136df52d77624d086e3358bbad1 SHA-256: 0f7d566a0fbe54ce6cbaded560b812fcc7ab53d4068f000100f4fd25fed3d9fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, hosting numerous PDFs on compromised websites, likely to obscure the ultimate malicious destination. The presence of multiple links to distinct hosts and the use of UTM parameters suggest an effort to evade detection and potentially improve SEO for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/8bf89b565b75223e68714aab0a0d807d/20101959873.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134e96e0a13f---kevamowilivobukupu.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/runene.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/fedewasizixebibovewevaku.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/0eb0u52cqik2f46cl5fptmgc65/tovogejexulaga.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614409edb66e4---ridawisisomiropilaruzalad.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/dolizo.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161461ffebfb29---98980924559.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/eb154736d39467546cadbde39d49a929/7765438226.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/wewelufulibaxumovurokod.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/70134718501.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/texegutoxidowutu.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/difesunorodedafap.pdfIn PDF document text
    • http://dd-eng.com/files/files/81113971097.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/16726099430.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/53904766148.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/kopup.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/34857268239.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/55571821288.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/46895583849.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329933a1ec0---wuxegorewidugukarawale.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/49789602293.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210907001055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bach+a+minor+violin+concerto+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_off0000db74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 19060 bytes
SHA-256: 89731acc96356b9c5c4ea7022b63fa27ed000e81a34a6464a1aaade64e3c6697
font_01_sfnt_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CE 10836 bytes
SHA-256: b158be8a6394ee2cf22d4d4aafa622808b2987a224ef441939a0bb2cd1e02df7

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