Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc70775f85d2c16…

MALICIOUS

PDF

166.4 KB Created: 2021-08-03 10:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f97fe40254cf98d0772c697f033139db SHA-1: fb35a1307c9af295a456e2908d793286f7c34cb6 SHA-256: acc70775f85d2c16e92fcafe560b450ca3c69b0b1d6baa10cc323a59ecf2a3a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or utilize disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://argekaucuk.com/nbg/upload/files/jozetofaxagefag.pdf In PDF document text
    • http://princeverma.in/uploads/files/78834125307.pdfIn PDF document text
    • http://air-ned.com/uploads/files/nagase.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/mitubalawoma.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/8fe8ecb57872ed0132003b16daa61a58/fedazupanulajodajosev.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/jiwifaxadixafas.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/83183076885.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2819bd22da---kamuzomekaxefijeg.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a208f175206---83568444810.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/gunafimagojoziwap.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4b917083---tijoselefub.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b8ad441a7---tojegujupozej.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/269eqjett2qajbi5nhaumq6hf9/kopulovekoteranisujeju.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/4083574513.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ee305911f49---51473820341.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/687e2fa480d9fed27715daa55b47f031/gexujozarapuruxu.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/siduzirawulaw.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/5moqvefbl3orunl1nnmsbpa9un/70859159826.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/59872071520.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/gafitamaniviwumuwuwi.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/75312617134.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/37173482974.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f1dd292b0f7b35ee4699320658da668e/dumaxurerinoragipadoxesuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=britannica+encyclopedia+2011+free+download+full+version+softwarePDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A6C 21912 bytes
SHA-256: 5ec32572695ae3fb8e09a89d63d23988e0c76d32ac2889a4bc035e6bc279549e
font_01_sfnt_off000240dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x240DC 16232 bytes
SHA-256: bf3ac2bbc5511ca59b022801f68684aa2b8ae7661b1a55c6866fed5ae8d27d0d
font_02_sfnt_off000256bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x256BF 11324 bytes
SHA-256: 3cfb9ba98d58a8eb65da31aa12a7ebf8f6c0e965173d7a1f27454c86c8e67476
font_03_sfnt_off000271bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x271BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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