Malicious PDF — malware analysis report

Static analysis result for SHA-256 957c3e53d02c2ffd…

MALICIOUS

PDF

87.7 KB Created: 2021-07-05 03:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5eb6f7667107c9a24ca3693c0ee06f72 SHA-1: 100d48fd077349ca7b643eae01047524558ad251 SHA-256: 957c3e53d02c2ffd245d7d20eadd27e16e5c674147c7afa79514a1a43bf8e241
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://247hvac.ca/fabulous1/uploads/files/89729288416.pdf
    • https://akproauto.com/nbloom/fckuploads/file/kakukejotarum.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a25da3ee173---totemadajubav.pdf
    • http://agro-vostok.ru/userfiles/file/relupituzimonineg.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160829dbd04402---sezidupotixulip.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc94417274---demoramiwawagavilexo.pdf
    • https://kidneystonetreatment.in/userfiles/files/83456182295.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609622670cc0e---wunevized.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce8e7ac75---67514227691.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/falorodafuba.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16080e01862df9---65287884848.pdf
    • http://ping-property.com/user_img/files/73526165405.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/hhhbpbm4m9mvq8o3md67avraa5/kipamofurotudil.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/e9dcc7acb7aaf9564dccaae07ec7d31f/78191402254.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/7b4a238790ead78e53da49e6771053f4/79061811147.pdf
    • https://aawyx.com/sites/default/imageuser/file/61086338732.pdf
    • https://alihuata.com/userfiles/file/34988477187.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e4b4b4cd6---kigawida.pdf
    • http://pytextiles.com/userfiles/file/pinurotisanuwaxujudose.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/gdbr8uqpom806dim58ki1sv63i/32098061270.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecf8e2a3d---fulelirusujukezomo.pdf
    • https://akproauto.com/nbloom/fckuploads/file/25447378787.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/1mcihcc8j1urdqess7vmjlujj0/67125285994.pdf
    • https://xo-sound.ru/userfiles/file/wisiboxunanipapusifu.pdf
    • http://geose.ru/userfiles/file/6006885103.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=famous+french+sculptures
    • 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_off0000f31a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 16792 bytes
font_01_sfnt_off00010b2c.bin
45ae6de5dbe599f3bb5a1e1fb4072d6bb5ce6405f14c83be2ad336d54c54a3ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 17720 bytes
font_02_sfnt_off00013910.bin
65ff3286bf3fd3573753ffd35cc63aedff05959e250cf26e0e8192847a8a8fdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13910 10728 bytes