Malicious PDF — malware analysis report

Static analysis result for SHA-256 042081875d94de95…

MALICIOUS

PDF

89.3 KB Created: 2021-08-10 03:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d75d2f30a9619a4f2fa2facd35ea79ea SHA-1: 32f66e277d7084d08b1c7265db5dd245c759fcec SHA-256: 042081875d94de95f6960407504e41a8cc9e1eb27cba7b50fc81ce7449136b6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malicious content. The presence of multiple external URIs and link farm indicators strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://infrive.ru/uplcv?utm_term=lost+lands+hidden+object+game+walkthrough PDF link annotation
    • http://siltherm.com/ckfinder/userfiles/files/29990564430.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a3bbcc6f6---61507905843.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d827855310---vorovevazenomub.pdfIn PDF document text
    • http://dges.in/userfiles/file/toponalixaxulixiveme.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/89847939942.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/lemdh2deqmher7a4pgqrn07e03/numotow.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e56954197d---wuvagatatatenitewavo.pdfIn PDF document text
    • https://sapporopools.com/contents//files/81010956353.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/lozugamav.pdfIn PDF document text
    • http://sdds.be/userfiles/file/detikilefobusopube.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/fawisu.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/72231199314.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/k77aqhouiuui9dt47etojc7d70/98048478081.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/6c4cca4030fad5c49ee7d5a82c6b50e3/78831866822.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a90b0e8812f---5711048666.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/ramenuwirokowo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/23a675de9659b43de91faa0fe86f766a/63196097661.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610e072d2ac43---57615833413.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609473e9e608d---79584691050.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/57458059081.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/d780ef4c25396b6b3e51efde80c92a88/9302865937.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/bosifudisazatixuxirodo.pdfIn PDF document text
    • https://ijp2.com/contents//files/nenozukuxulot.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4218a3ed7---gologugesijuxilojes.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/junojipuxamidoripirasulo.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_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 18408 bytes
SHA-256: 3b93be5c4d3f5830af34d4a6e43e266c4ec7fe8ba3a37753ec5c58f38d0ee7f9
font_01_sfnt_off000124b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 11324 bytes
SHA-256: 36fd7eb412d318448f00374898f109a3c46515ac0606927b4e9ab408d55bd80f
font_02_sfnt_off00013ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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