Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d7d8b922c2c01f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 08:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94a7cd7f6ac9334fcb716c4e89b7aed2 SHA-1: 8bc0e396dbfdff645968fbd78c34ead599ef2bfe SHA-256: d3d7d8b922c2c01f47668cfad3d7c42e098293ef71ed9098e96b408401dc4f2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0f2d322b7---26980937613.pdf In PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/444a7b1fac958956d6bf2666aa2ee42b/jaxupelevijawojalag.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/bumukegogugevakugulim.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47ac626f12---22203528654.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/78299690025.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/lilix.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c3c6507e1---tufiteridox.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/27362383264.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e090f837875be83e9d55dd9df8a04ece/6593553357.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcbead05d9---jebotobujusawed.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081196d84862---xiraxilalasox.pdfIn PDF document text
    • https://penal-garazh.ru/files/tonuteregaruwobonedez.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b9027820ef1---32156068685.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/vmhlspcj46dhsp8uhbkmrh9ff3/66206523314.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/lofuvazajononodibus.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/29716387760.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e8c16bbdae217b1112fa9fc72072af17/mavogojimusoriwi.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/77859955467.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/u4e12r9g0np5l5304sdl29lovc/tujonet.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/lokilo.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/mimewawu.pdfIn PDF document text
    • https://mojer.bg/files/mitotez.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/sepemakiwab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=proses+pembentukan+perda+berdasarkan+uu+no+12+tahun+2011+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_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 16856 bytes
SHA-256: a8ae105005499f23756393e77e6283dd41310e940a820b01d21249fdbe1bba12
font_01_sfnt_off00011468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7F 11252 bytes
SHA-256: ab9e9101999a427354af2810de6cb5ef1263e54f160b23e0db6dbc5701649882

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