Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef320c715c66f2d8…

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 05:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 566c33ffc49737bc07bc062b5cc228a1 SHA-1: 0822dc8baffd135f40fbc486c11cb4c8ccd5b370 SHA-256: ef320c715c66f2d874943be38b2193e9b639ce4126ea87d2830b100805c49335
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=6+elements+of+a+short+story+with+definition PDF link annotation
    • http://www.lebedosapartotel.com/data/yukle/files/nelumowizeki.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/55849616956.pdfIn PDF document text
    • http://plncse.hu/php_data/file/xofopuxofupudarep.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e3e111a15---nopugizazo.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/7489609026.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/3oqv6c7qckia1rlo8t3bhc0t94/39847714508.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/95571196021.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/70055102565.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b88df30b5f6---gekuwojizivofigimisaj.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcd80d3a7---74638216459.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffb027db173---37668614371.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609614d1ccfb8---67025598789.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/16778045898.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/82181126311.pdfIn PDF document text
    • http://zzquansu.cn/d/files/perebeduginolizugobi.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/nebajidaguz.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607064fbc029b---39824494801.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6790dca4e0---muxovagojiwet.pdfIn PDF document text
    • https://doganagolosa.it/file/30804432739.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e969b88eb---zoxuwomole.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/pkkn1s9mo1jdhct8lkf6dftg23/34142226711.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d0dfcbfe3ac7aff76097cb42c17a9038/bogeku.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/f3fe7f58447d2cd8483a1117c983d2ca/pekibokezumelivasozol.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_off0000e982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 10892 bytes
SHA-256: 10b011717d13974bf8f21152fb9ea612d0c8817a2ed68216a6bd5372c11634c2
font_01_sfnt_off00010299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10299 18224 bytes
SHA-256: e2a3affe3c516d3b8173bff1cb4affead3b0c8107443c815ec6bfc4ba9894e63
font_02_sfnt_off00013100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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