Malicious PDF — malware analysis report

Static analysis result for SHA-256 8043cccfaec4d697…

MALICIOUS

PDF

75.2 KB Created: 2021-09-04 05:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f8c70df4bda0963604e01b97c256be12 SHA-1: 8aa591ca34a9f7c4affab305411e4f83b41cf183 SHA-256: 8043cccfaec4d697ef5198e5631266214400d1b5be93355226b6df28927d2250
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=restful+java+web+services+third+edition+pdf+download PDF link annotation
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8bb443c87d---pupitup.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/romuvumilodevijafo.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/48571630030.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/xetof.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/69565158679.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/86965690998.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/tonax.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16104aea55c770---60840374506.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609366d7b20b5---vopifixojabufimo.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d49112f3d6e---fetofavesejama.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a009912a06---venuraru.pdfIn PDF document text
    • http://imi.vc/upload/files/vizusebarovikizom.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/761e6f840b705c6e62a2a2dbab425783/puvixipej.pdfIn PDF document text
    • http://yepuco.com/uploads/files/fejejik.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161041e4949119---6604670593.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de7dea91a9b---gemenipixoxasupopus.pdfIn PDF document text
    • http://fructusartis.com/i/File/59527839806.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/32176313435.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611d9f6aadacb---zizasasokezakuketu.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/porilosafitisalopobepaf.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160874523bee7e---nivisosusawupakiwezusib.pdfIn PDF document text
    • https://tempegaring.com/contents//files/xolisefununubasapiz.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2bd665cca0---42494404363.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_off0000c106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC106 16624 bytes
SHA-256: 6aec118d29286ea85569b19e651e2d13a6330d4effaf1a40fed982579686bbab
font_01_sfnt_off0000ebfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 11284 bytes
SHA-256: 02ec4d6badec7cd65d65807f4f84c06369fd8ca748d99d970520eb9e3b2ee500

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