Malicious PDF — malware analysis report

Static analysis result for SHA-256 7690ab028520914c…

MALICIOUS

PDF

102.9 KB Created: 2021-09-05 15:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bfb950e9f3539b3334f94fb727be234e SHA-1: 47241c0b0ce3f6eba2942aae6dbfc258bb6c4674 SHA-256: 7690ab028520914c954dae1f9b467d296fb55299d3c4a31a16ae18d491379a1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or scam campaign. The presence of embedded URLs further supports this, likely serving as lures for users to click and be redirected to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=evolution+of+traditional+media+pdf PDF link annotation
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/uooqf29591bf4f5dd6cublp4k4/kegufoti.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e168c49c99f---55959030004.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079f6cd14471---3138453134.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070539e8f785---5096945561.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/rejerumar.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/53709413342.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/768d1cbbb8f70ddb402844ee42a1947d/28265566098.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f36636b0635---22591215915.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/65128828422.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7471b3b8e---vizosubikukuf.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/30e4528ba15fbef30672996d2da5524d/37020966834.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/19923862602.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/tsditu99rrn9a9s6i5r2p88sn7/57923477085.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a65fbb9ac58---21503109953.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/a94d9cff552e5c57fa7a4da93c2eaab0/pagovopenopevuk.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec21c9a928---19229585355.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/92020921457.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/50967493217.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160927bf510591---puwor.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/rojipukizeb.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/94214b6eec40ae6a8fd5fd5e11b57d7b/ripaliw.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/b9ncu2ndihpjkggtu0g9r1gfi2/kodusamoromolavoxoguzag.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/25ca4a5c84ec6a3d45b8c68302cebe2c/77508814496.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_off00012da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000145b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B7 10640 bytes
SHA-256: e48d31fdd651aacb402d6c5814effd9b9c1c3d9ce1b94f7e64e0b7e42e435e2e
font_02_sfnt_off00015dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFA 18756 bytes
SHA-256: fa4c81f55474b87e4b27fa851434432f84cc6dc8d5ef9a3961560dcb3a77e9f6

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