Malicious PDF — malware analysis report

Static analysis result for SHA-256 e69f5c806cc73866…

MALICIOUS

PDF

87.8 KB Created: 2021-08-02 00:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff94fbea6f4df94a63c77e35304c9d2e SHA-1: dc345840bdab44b57999660060c2c6efc32baeac SHA-256: e69f5c806cc73866cf3d19969057b0d02ad0198c7581b23d07803479f55fee0a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns align with common techniques for distributing malicious content via seemingly innocuous documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.gurgy.net/ckfinder/userfiles/files/roxuxumuxedo.pdf
    • https://xigmatek.com/upload/files/rosuzeroburugoxigibor.pdf
    • http://wowbond.com/upload/Fckeditor/file/julumorumasitevofido.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/nipemuvimovevolafaxogetu.pdf
    • http://jplus-ag.com/upload/files/BodyFile__61004E3457952.pdf
    • http://lnaixi.com/userfiles/file/20210615152513_1154926996.pdf
    • http://rolmech-strzelno.pl/Upload/file/turakofegow.pdf
    • http://bassbasement.org/userfiles/file/35269991019.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/ldf1o8snituj71gtqh2ek9get4/36183947914.pdf
    • https://topupdana.com/contents//files/junupalasifonenedufu.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e768b46736df87ce04c54738f4ae182c/rujuxebupinaw.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/61918760501.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091353390a52---2548056693.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/veweretapesifenuroxa.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757449ecd7f---91082890448.pdf
    • http://jjmcp.jp/userfiles/Image/file/61689420267.pdf
    • http://ekolojikweb.net/upld/userfiles/file/zajufu.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/34qon5ul81nhffvil054ie9ni2/91356305596.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160835cfd89e49---36223322398.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae53fc4a3fa---fotaromamagizox.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/nawuvesibalen.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/c1d26ac24cc76e43642cc5846f494bbc/dopimazitomefozajitepilof.pdf
    • http://www.psoealora.es/ckfinder/userfiles/files/50504175301.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=perimeter+of+triangles+worksheet+pdf
    • 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_off0000ee26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 16792 bytes
font_01_sfnt_off00010638.bin
d7ee972e269b11841b77fb687fa27d4a642daccdf60807d847f3b678fee1256f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 17784 bytes
font_02_sfnt_off0001355c.bin
178c5a81b1aa0d2eaaa6f3bd2d7a073f0a9629ce406dc1ad15f79a5e88ad767d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1355C 11124 bytes