Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1d0c06edb7d76f…

MALICIOUS

PDF

73.3 KB Created: 2021-07-01 12:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c621f547361947bb3179a141a44142c5 SHA-1: 86dd5f9e3f4c0c3f63773e35ea4e815af1b31f82 SHA-256: 3f1d0c06edb7d76f34bee5e9d0b227a857010e570b7f3d9e625e61dd31e18aff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://investin-khj.ir/ckfinder/userfiles/files/90066781693.pdf In PDF document text
    • http://logistra.fr/ressource/site-image/files/telurogopifulilamolav.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/387iq4ljscgkp7q0hss4d198ea/potekaworurami.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607d754c9669f---dagiximogapikuzuwifipodek.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/15025693850.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/32912703edc282aa421e115e3d4e2518/kepanowowolapenujuniwixat.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/59335845201.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d60453178---wajapesezuluzidexotu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c5665556f7e0165379d7b7aa1191e130/sizizuzuposogojatuxe.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb7cd0104b---serefugasoteduniwa.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f00b88810b5c88f2dd3db795cfd94e78/48222957196.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/h7h06b2husdirlc778tj5jb1ri/zalivetubidagizukazag.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/fijb9fvpmnahbge7c8njmtc7h6/dijamusowujo.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a62b9eed5---lazefesipokepemu.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/zagutasajabuj.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/53629648194.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/figax.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/cf1a19653d5b51587beeaf435baab252/sibav.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/da888c9fcbce097658a321b863414b7e/topevapolu.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/89906944128.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/sesenozifor.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/juxigejorugaketerutiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+is+icon+badgePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC8 16056 bytes
SHA-256: 102f9ffcb51698243eef7639ac41b35f226b790ce44b05bee2cc4ab5ede16295
font_01_sfnt_off0000e6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 10636 bytes
SHA-256: 15a6077890aed761572e6d81bd1e76fc1a3f832ad659911b026afced4326f007

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