Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e49378398b6a81…

MALICIOUS

PDF

84.6 KB Created: 2021-06-26 23:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a71a27ee7199948a770e5cd91e6ce43d SHA-1: acb292dd0aa695483cbe950b6fb2f499809eefac SHA-256: 42e49378398b6a81b912f4802ffe0da1cca097d8c2b1523508f44b1cb3cea812
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links suggest it functions as a link farm to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f08eade915832ebb92839f8f9276091a/56186067956.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/3ds6t16dleb29o8dip2dvmrk0g/40279235882.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b6b17f501---11557443076.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda15195f0---zojijibi.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33d9d8422---dutukis.pdf
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/vusugijoxoli.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072422e49e1f---zusokevi.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa65c348599---benoduxedenijo.pdf
    • http://gayaarchi.com/userfiles/file/20210519221548.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca0a3c9ec---80102583053.pdf
    • http://rasmesafar.net/basefile/basefiles/43169077980.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0cb1fe0b0898768d756a8d500b22001c/jamumaneditemowuxusewero.pdf
    • http://shuimotongyuan.com/userfiles/file/91533078009.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/301690beda9a18355c8429e8b8033096/luzimukeraxip.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/58c35b1ac2a1c635028d7b192bceae05/20050475070.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072549edc335---51911324610.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd29c01249---78000628010.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b55cee5addf---wesomafapejejuw.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/36f0542abbea4bd2ab0317d9d28a4a29/47968889660.pdf
    • http://dambi.pl/userfiles/file/97875703438.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1ca901aa72d3fb648ab5e9b09d29a83a/25113011214.pdf
    • https://gites-les-bardots.com/userfiles/file/26800293989.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=text+books+download+sites
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b27941e81---37453116678.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea51.bin
8b1e0188c9e5c6e6c44001d70fbcfbb4bbf8ebccc38266f601e6b7747e278ff4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 10524 bytes
font_01_sfnt_off00010283.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 16792 bytes
font_02_sfnt_off00011a95.bin
128a6f161f0324d662cac716e1c6280bbf9e3ae8c60b498d763fa13d5c2dfca5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A95 16472 bytes