Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d7a5c00f9412df…

MALICIOUS

PDF

70.8 KB Created: 2021-10-02 21:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6d770ab64cf0b56e75ae05bb59fec342 SHA-1: fead3f89f61b23834e630757e01f462b5de056ca SHA-256: 73d7a5c00f9412df39e08f7490b47d4de3b844ec8239fc4d6d8ca34845fad65c
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised websites, likely serving as a distribution point for further malicious content. The heuristics indicate a pattern of using compromised CMS uploads and disposable hosting for these links, suggesting an effort to obscure the true origin of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://oniceh.ru/uplcv?utm_term=graph+data+structure+example PDF link annotation
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614255cdc8ce3---10627921966.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/98477125291.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/sovukenalezux.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161488e22df95a---sewaxatutemanilixubiti.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/42367418525.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/501031882df85cd1471dd23f591c1862/31714868233.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/21306861286.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161315c7ac5866---61544181837.pdfIn PDF document text
    • http://artio.pl/files/files/95641912738.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/61522646997.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/90906319132.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/4gjkcl5q8ilgtsmhm4b7je7o07/pekusadalizew.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/senapakipe.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a8c149098c10dacfd2414146b7c39ee0/87479328566.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210922_85081D8AFE1564CE.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/8448a7ef8fa4ad201c94cada1ed0ddfb/giwuxamadujawesaxogosam.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/mosisas.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qqg7i70dpjpmto30imsto3rrvm/kogijefajupasi.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/16966334549.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/rufopige.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386594b9e31---30013348671.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/67114686710.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338a5512f06---jopepu.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_off0000b1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C4 10704 bytes
SHA-256: c02dcd30a3f73a634d78c90cc6460115692edac30b5b324cf758bb00681684e7
font_01_sfnt_off0000ca70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 17480 bytes
SHA-256: 76473c50115496b6b62009ce183a4a563b63bc5655d7ba7cd1ffe464297e116d

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