Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d3268b3e318c1f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-02 14:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a9254eeda1abfba4c58e405a033be739 SHA-1: 38f1c87bc854288b95cd4e290ea282199ff6ea9c SHA-256: 77d3268b3e318c1fb650ecf5a9f858da337e234ac7fc25331af6ed15b4133169
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised or disposable domains. These links are likely used to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://alrabbancapital.com/file/files/tamusadaserexapaj.pdf In PDF document text
    • https://mimpishiodua.com/contents//files/wubegizamilojigez.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/66349315161.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/zifapebiwatubodeg.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba312127bf59a76b3b679047d4f8d822/31605969245.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b8133dc5---moxilom.pdfIn PDF document text
    • https://inifd.london/uploads/file/rifotimedagafalalotu.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8d450c8c151feb96c1a185a1f43fb32e/14549333148.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/011f1c1cf8af32aa272e6b3145a02535/75046574938.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/pilevavivafufuso.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/luzepavokedomukewatipe.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/fusixejomimuzubeni.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/xubigokun.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/bumikumifoxixakuzigujaje.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f1f6308ed04472769e1d687a3f91d340/rudagimatujeb.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/34726660426.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/34628431643.pdfIn PDF document text
    • https://12shio2.com/contents/files/lusonimogatatotapawen.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/860664065d645061b85d2e7af931924a/51069315362.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/wesorivet.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/fimeterozepakomizajoripa.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/95424404214.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072e562ec91a---90441506528.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/00bf5ad10ca48095c4cc016bfe1ea165/libufifigirob.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/58005382290.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/jabeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=breast+cancer+treatment+guideline+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FF 15484 bytes
SHA-256: b1bb52c9c8a6be847e9c96d04d5d99f619135d4eef342e26d35c0c3ed1a9712d
font_01_sfnt_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001005a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 10996 bytes
SHA-256: 240451908acbfe2ce8a77ab00ac3ab8bd1719397ef2c9966c8e7e543368a6cbc