Malicious PDF — malware analysis report

Static analysis result for SHA-256 994e9b0aff77c08e…

MALICIOUS

PDF

77.4 KB Created: 2021-07-09 10:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c59b136ddfdd59ab78372e9136e54efa SHA-1: 9093fc2621c7000480be4a8a78efb58fe6cacfb5 SHA-256: 994e9b0aff77c08efa3f54f159556e05bc28d0a956902fb42b6f3a3c762f9dc2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. These links likely serve as a link farm to redirect users to malicious or phishing sites. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://laborke.ru/uplcv?utm_term=document+controller+oil+and+gas
    • http://kimbuunguyen.com/uploads/userfiles/file/morijot.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/dglbl12flg73f1n91ee4bcfpr0/sufuj.pdf
    • http://vinmexindia.com/uploads/segidedebovuzujal.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d7981392---sobojutisesa.pdf
    • http://aliceinformaticasrl.com/user/pages/50474473481.pdf
    • http://etcad.net/np/upfile/file/12575371351.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7ef2f11df---zifilijazegibulebovalo.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a644bf4e847---40431424459.pdf
    • http://www.jucadent.es/ckfinder/userfiles/files/nugezakemaja.pdf
    • http://computergramm.com/userfiles/file/57826464321.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5e916ec41---61957915845.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/37d89558d77360df459581d8bc5bdb51/xusidonedibuvebizox.pdf
    • http://patriabrno.cz/userfiles/files/wakatagodewikemixivuzof.pdf
    • http://nhandieurangmuoi.com/ckfinder/userfiles/files/gifagowefajenimudad.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/23606494019.pdf
    • http://shuswapladystriders.ca/userfiles/file/90201557937.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608778633b018---kuxagi.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607109c9b4010---majusip.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/ff55c1464c20d309ac52201259cb57ca/regomop.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830f8e268ab---51074332387.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099cc4336a64---99231525818.pdf
    • http://accessiblevehicleservices.com/userfiles/file/12598051930.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/h89obndaco8k1rttj1sgnpviuv/19538110928.pdf
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/91158064434.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a70cb8e3f9f---pajiduromatetugefajudi.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_off0000ca09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA09 16792 bytes
font_01_sfnt_off0000e220.bin
a0fca65f3bd431f733169584b32d1a994e4a977b2d76d63243115a24a684bea8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 10812 bytes
font_02_sfnt_off0000fac4.bin
70084bfadb7472b89179748c8c826fb8b430d236d141a94597f43ea4c90638ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 17404 bytes