Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e8bcccb9eb46af…

MALICIOUS

PDF

120.1 KB Created: 2021-07-16 04:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c77651ac56499c1e2f33167fd85bfb8 SHA-1: 73d850d6460638eb82f163dc267d17b40e292d1b SHA-256: 73e8bcccb9eb46afcb8aee40348d4cff9a31c9ec3b0bf375c61e066d0c031aa0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to deceive users into clicking the links, likely to download a second-stage payload. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://coretry.ru/uplcv?utm_term=recourse+promissory+note
    • http://dawahcity.com/userfiles/file/xafuzaposufateze.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e46a2c82da---litig.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc2fbb182---wugone.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160730e4208f3a---76098788140.pdf
    • http://qazaqbanki.kz/data/content/files/51045548646.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f2a5df77f---32414293728.pdf
    • http://www.gesas.it/media/mailinglist/file/fajiwusuvukezovikonage.pdf
    • http://peneleos.pl/userfiles/file/59159468288.pdf
    • http://sys-svinding.dk/userfiles/file/movizorogot.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/d86badd4f970bca388cb2bd9309d994e/58244236762.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d262bd3633---45892851414.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/f115d84cbcf19e590943f3e719de06a7/31038545109.pdf
    • https://bitree.ru/ckfinder/userfiles/files/jamag.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/1587f45d9abe5d1fcfba767640a5eab3/81325959670.pdf
    • http://painttechvina.com/webroot/img/files/tunuwekezemutadekelip.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/fe4da2ead31bafd8da9b8b635f13110f/jurizuvexeteniviwejizo.pdf
    • https://dusunceokulu.net/resimler/files/25841793259.pdf
    • http://pk.mo/userfiles/file/66384131015.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b349ed859---robolunekefepowobufe.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84636cd2c---tujeremefodoxemu.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608557e09145c---fupuvufedoniripuvefudeni.pdf
    • https://jordan.si/dokumenti/file/85897546163.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b97d477c39---5790949813.pdf
    • http://cuacuonanbinh.com/userfiles/file/26219752083.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001745a.bin
531c9fd067806cf79a9c9eaf58d3a6a493e025a2cd6d5c9a3b558887266a5a5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1745A 17504 bytes
font_01_sfnt_off0001a279.bin
e5470f559aef64ac33fdfcab128723f00ad2010bfcde7a16f436ed5941be51a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A279 10584 bytes
font_02_sfnt_off0001bab7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAB7 16792 bytes

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