Malicious PDF — malware analysis report

Static analysis result for SHA-256 5342fc01228e4b2f…

MALICIOUS

PDF

101.1 KB Created: 2021-07-21 02:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ac93e8d271d4945cd449d1415faa4d81 SHA-1: c6157497ade6148373f81be2a3cc15764e2ebd1f SHA-256: 5342fc01228e4b2f5b73ecb12609b42c511141c50f48f39eb9ce6768dca17b98
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or spam campaign. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. The presence of numerous external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/24e27d8b9c8bea917607ec421c4bb0a5/kegivibibiwekeripabuta.pdf In PDF document text
    • http://homeopathyhongkong.org/files/xopulogorowakefurup.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/72007154741.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160770755cd115---zawotikivuvaluzoxidig.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/jilutafovabowazuf.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/mixegupilovelejotililorav.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24efc681f---96029053398.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d87665e0a0---sivunukikuribobabu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608236dab381a---85003226018.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/oslukruiq5pgp9uh5i2u9puu8m/vuxusapitigowo.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ed559dee79a---sanibeletomedevonarazeru.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/juwafebep.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/c774a8d887c1de45b2ea26055044d9bb/gunesuf.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/16619785751.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/wivosudij.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a38c63b119f61063016c19034419ef9d/36062919436.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae351027d82---68729722990.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/84918265592.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/72eeb8bfc2b7b800de8a0582d3c7af98/ruvebomidepidudi.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/gokadupo.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/dedukevoni.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/0eb23e6bdd637f11d5a8b696235a5328/gawisesudisawa.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160832755215ee---73959837389.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/729495855.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/zemeganujilemodanogigadut.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b7954562---79871229458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=where+can+i+watch+lord+of+the+rings+seriesPDF 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_off000124ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D00 18424 bytes
SHA-256: b9b460ffd034ea7ed1e3c7e75e7eb9a81a73e4d6e8c66fc336a0a9e441e8614d
font_02_sfnt_off00016c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C28 10836 bytes
SHA-256: 49207f534f16a52f0db120665d53064b96d5a3f1f72e55bdd98dc3afa6a2ff58