Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9459fa678f71827…

MALICIOUS

PDF

75.3 KB Created: 2021-08-31 23:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 671aabd16275a2b84c7c9eba88da2a85 SHA-1: 8da60a71cd7a4163d316ac4ae99b3c6c5e318d41 SHA-256: c9459fa678f71827d245ee74d3ee76b90862b10a3f041cc315120e11c1e18d12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c866ede6cb---46203152345.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/cfer2u8j2e0578nll4s4ur3lsl/15830366240.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4b83cdc7418b0008b884c8f3d13474d2/giwatawipugejonaferofiz.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/4d582841f4c87c12f58315ab79b16b00/nunetuduwudemoliju.pdf
    • http://elm3rad.com/file/50883028006.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/h4uft1ut2e96qs9c0otnvf21mm/79687260756.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/qh8hdb5jong28bjsvfbjc660u0/33304104666.pdf
    • http://architettoannalisatinelli.it/userfiles/files/93978280461.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c56081c4aa6---memuwopoti.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/baxevulafir.pdf
    • http://fujavietnam.com/images/Download/81723082490.pdf
    • http://bhk-aindling.com/userfiles/files/rejejurigitodegix.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3681qtk3iu37ggj45l5aaeqv16/kigadawopi.pdf
    • https://wrd13.com/force/file/tevamuga.pdf
    • http://zit-tech.com/userfiles/files/megavijepirosefamozukavor.pdf
    • https://eagle-aviation.com/userfiles/files/62307515860.pdf
    • http://brooklynsmokeshops.com/admin/images/file/86344372769.pdf
    • http://myapartment.de/web/editor/files/86240036502.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/adc8e3b8fd1a3324778a1cf5ff3e5082/45447624172.pdf
    • http://salsainkonstanz.de/media/files/xabosagikarunu.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/37023729179.pdf
    • http://yaqeen-eg.com/userfiles/file/29335557069.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/60778767035.pdf
    • http://jrpst.pl/userfiles/file/nuxurotitinowazasuv.pdf
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/wovevepovemedu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=member+dereferencing+operator+in+c%2B%2B
    • 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_off0000c1ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CA 16792 bytes
font_01_sfnt_off0000d9dc.bin
bfe829fb1a7a320e5ea0213333b2f2056615aca145f548700f1e6d781cd64849
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 16952 bytes
font_02_sfnt_off00010667.bin
b47cb49ffa5ad34f1217f76e55e057f054add3203173fe791b13d7a4be3a5f65
pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 10880 bytes