Malicious PDF — malware analysis report

Static analysis result for SHA-256 f993123551cf2a32…

MALICIOUS

PDF

101.7 KB Created: 2021-06-26 21:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 029a717ded74d19c82a121bd9664191d SHA-1: 4be1b6a459f2e9cfa0c213b48d2f1ca08451eaf4 SHA-256: f993123551cf2a32fc2030daba05f63c5c900a7182af02f692ca4adf7310a7a6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV and an ML classifier as malicious, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple external URIs and link farm characteristics strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://pistant.ru/uplcv?utm_term=ichorous+greek+meaning
    • https://aduanaldelvalle.com/userfiles/file/14336417969.pdf
    • https://turkihale.com/userfiles/file/pezadufonirofivutimo.pdf
    • https://panificiopasticceriabattaglia.it/file/depami.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b59ca7beec7---39222558206.pdf
    • https://krassimirtaskov.com/userfiles/files/28722920021.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca38cab3c---68575252521.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608689aa18bb1---sijeravaporataz.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/4d29af7bffb3fef15ca94063486469bd/nepojowusesiti.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1a4e168a890432699f089b208d03b9ca/19373893560.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819f566a5d4---jiwosakawetomokumol.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/a4a967870e469cb5ad2f014b3180ba33/30831352410.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c9308c122c1---bepegofutiditifakakizefez.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2572fb1832---sarazolaxizoguwe.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1dd83e3e6---savosirugepifaro.pdf
    • https://landi-bg.com/images/file/redurokutemawuruxosakoko.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/da224b0011574a026ca921e3fd372cea/42415278600.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160ad294c7e549---xopudile.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e29aae020f3e6648473b32e312e20b92/89555152684.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c7cec0884244b815355e2537b83fbad2/lerutugopunefakalilowo.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0afebc3c11cbc5d3427130b65a36d3ee/4202574514.pdf
    • http://www.bluewhaleline.com/image/upload/File/zekajowekugerofus.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4f12c49ae---16576098062.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/f62024c2dc598bada1e341ef5705f084/83281301757.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe32.bin
07526070b4f09b863815c83b19a21d1d8cf3cd2c390407c4291e9de7fab816ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 10676 bytes
font_01_sfnt_off00011681.bin
b64b2132e7b30ad931d163a0d83bc710a576bfd8c38ec18a7d682a3d922821e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11681 21156 bytes
font_02_sfnt_off00014b80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B80 16792 bytes
font_03_sfnt_off00016391.bin
a0120e7b2c6575f7412de4ef7118823b42786a55d005a20173c8e8f98afc49da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16391 16752 bytes
font_04_sfnt_off00017bb1.bin
04bde56abf7206d0481ce6b981a531ab0662a471772d7a2854aefc879a12a35a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17BB1 2716 bytes

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