Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b361c641255ea6c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 17:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 65d98a5793731b5a75bf95572d6b8b16 SHA-1: a3bd2304ef4923884a5cc24d16231c1e677446b2 SHA-256: 9b361c641255ea6cb74c6e8a37245e73d60da0c344e64c3fc491237852daae65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised sites points to a tactic of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=latex+file+eps+converted+to+pdf+not+found PDF link annotation
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/s652a9746gujaotgb2781rfppo/sitojelonajabodakimigojom.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dd7f05ca3e---41181664726.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acf28859c21---pusemerivevo.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/b2ce0fbf74d91ad68765c85f71cc9540/83539681512.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161168e6a485e3---73705875776.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc1de1ab5a---visipijug.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/b581616c0a6563adb167ba14cba442d3/86833461748.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/3172445978.pdfIn PDF document text
    • http://elskenecologie.nl/files/devekop.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/lejalexex.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/bulatorobo.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/wetavixafofavawaxiv.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/29821367785.pdfIn PDF document text
    • http://186086.com/upload/files/30885551987.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6325dab266---31131934036.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e7907355f16---36985779597.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a823f74c22---4364183910.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/7d68925d061a662d05d632cf31aa7cf4/88458922937.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160758120a5e8b---35944183497.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/57015382210.pdfIn PDF document text
    • http://beiks.info/public/file/41931887012.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/julijezap.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a8971c867---15787450046.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/gukigelodewuluvirofu.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_off0000d5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 17712 bytes
SHA-256: 2ed796140ae8c4b53fb3bdbae81ba35d9ac534a739df0b3ea2c137ee87f9e0d9
font_02_sfnt_off00011b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 10836 bytes
SHA-256: 5e21deaac96a119a7f0ee68c9f6f1edb5539be9360a408ebd45fc103fdf6d818

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