Malicious PDF — malware analysis report

Static analysis result for SHA-256 93574bdea6c0e59b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 07:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d438ead0d7ad3468ba1d2e3ba9052b04 SHA-1: fe531823fee26f0eb934adcde50dfebab2b82705 SHA-256: 93574bdea6c0e59b5410cd3d3b4f6ecb6557703a29ff426effd195df4940c37b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, suggesting it is used to distribute phishing content or malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://medvor.ru/uplcv?utm_term=chord+dasar+piano+pdf PDF link annotation
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/c023b3face5e335625bca5b214934ee6/81339924955.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a7174830c---ropifewi.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/joluw.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/duzolodeniw.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/38067180011.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/s9ja8a48jkfkuhaqerdkd979ef/furuzisevuzileromugotid.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610da8867c381---sulux.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/savoduvixo.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/kuwotopa.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/79916230362.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/jozel.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf83c023be---30637237544.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/99950049606.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/sosojuzafoveko.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ds5o7pnk7clhjedn80iqj5u56u/3925654212.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/73830603898.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf92869868---zogugixef.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c018ffe2f693c573970da9f46ed631c3/sinotibatiraxo.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/htglp0kvkh4ujjo1rtrfe4k5p6/kadixozulofibowew.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/polazodotigig.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///29004222046.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/zolifuze.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/f4d7cd93edb2298fd2b3ac4b3cef1bd1/16058750005.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/51111200459.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/76871430900.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/feduvudezefogen.pdfIn PDF document text
    • 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_off0000d280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD280 19680 bytes
SHA-256: 035ce53b1550ca9cf23f675e0fbac8f70fe26434afb8a59505aa0c29c953272d
font_01_sfnt_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C49 10348 bytes
SHA-256: aae27b9c78bcbe3a40156ba4e3e8b751636c40ac4a7faf72dcc1a9e80915567c

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