Malicious PDF — malware analysis report

Static analysis result for SHA-256 37dc6ad54c26e850…

MALICIOUS

PDF

76.4 KB Created: 2021-06-17 16:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbdbfbed07aacd2ce2a3acc8c5ae719e SHA-1: d1818c6d85e2e17d134fd728405d659b31ab0200 SHA-256: 37dc6ad54c26e85075307f4e4118335aa5c806af2c5ef07349b4c744da35bfa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a lure for a movie download, which is a common tactic for phishing or distributing malware. Heuristics indicate the presence of link farms on disposable hosting and compromised CMS uploads, suggesting an attempt to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://richmediahouse.com/admin/uploads/file/pakorupawofiloxitupeve.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/of7mnp6rmu80hjp40itguo9n9d/vinejofapizovikumi.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce836312af---baxebuzoxiwegoxogo.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/eigdt74a5mhp2rl0l39s5c1q8o/figonigomono.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k38r7njtqlnssf30evjqmqrah7/vixewafarupemisiwigomop.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089888593c5e---rofolisalo.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/bb917367cc699b24193ef0404f796dcf/vudijulevijulof.pdf
    • http://teenaramainc.org/clients/875997/File/96314281870.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/v9j8514uaef1a4uua8sf1h4534/mosujom.pdf
    • https://seeandhearbetter.ie/img/shop//contents/45350901720.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900ee3c7a41---86924466526.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00c51d3f65---52045621175.pdf
    • https://medtek.vn/storage/file/70788915972.pdf
    • http://domplus.su/userfiles/files/gugavifukivodifuxebin.pdf
    • http://capmar.eu/userfiles/file/luxufujixu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=five+feet+apart+full+movie+unblocked
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0de.bin
1222f986d2e3eb4e9a19454b6b374c0518ce31602710e1efafbb2021dc819c46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 5340 bytes
font_01_sfnt_off000102fa.bin
124131b8c280cea49f592ba9b75f48dfc9e4b537fdf9246810e07dc71e2af90a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 11344 bytes

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