Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7aa982a7920bd1b…

MALICIOUS

PDF

86.0 KB Created: 2021-07-08 08:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6db21daba3ca2415a8ebe9786d31af87 SHA-1: 3bcda3e3a241223abdaf575aef6ef78e725e2a91 SHA-256: c7aa982a7920bd1ba1af78327b8f11585e61ec70ca828a0524acacacef365197
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites, including WordPress upload directories, which are likely used to host or distribute further malicious content. The presence of numerous external URIs and the nature of the heuristic firings strongly suggest an intent to redirect the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mdteam.se/ckfinder/userfiles/files/miwajuvixozerobujale.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba87cbc5419---gizenutunewexoj.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607714185558d---99351862476.pdf
    • https://dammesliepas.lv/ckfinder/userfiles/files/29799765377.pdf
    • http://churchillreunion.com/clients/72216/File/lesuxasotuvutizodepomasa.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/16ff3da689a124ba8be19b9864fc3f72/53581543921.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc81b21b3b---26541139278.pdf
    • http://119hero.kr/userData/board/file/jakib.pdf
    • http://aire-limpio.com/img/editor/file/2970169185.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58d9c6a60---zibelibodabidoxodaxe.pdf
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/68469441134.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae5f0472ed---32346858223.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f2af222bf---zazasevodijuwegof.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d3724bd93---71805209844.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73bcc30f81---79078288792.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee38aaed4d---gomil.pdf
    • http://criollo-cocoa.com/userfiles/file/27666475547.pdf
    • http://retco.ge/ckfinder/userfiles/files/mewirobalerex.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/70a8483b76c38c3d3f716034949beb27/siserove.pdf
    • http://nhasachconggiao.com/luutru/files/gegokugunabiv.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/20eb75ca1bfced7319ecee17517e70bc/964060216.pdf
    • https://bnbcostaverde.it/userfiles/file/98810919504.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pic+collage+instagram
    • 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_off0000e98f.bin
a4091861c41e9c6c5babdbddc204872301551ef414d079f55238bbedadb18554
pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 18616 bytes
font_01_sfnt_off00011965.bin
c8cd42b2349c8ae379a7ca963bb3b01665c7ba01127cf1a7d9499e89d5659165
pdf-font-stream PDF embedded font (sfnt) at offset 0x11965 10572 bytes
font_02_sfnt_off0001318a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1318A 16792 bytes