Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1dfaa766347f0d…

MALICIOUS

PDF

71.7 KB Created: 2021-09-09 22:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23ca17faf790a184c9dc5c73fd6cb48b SHA-1: 044b0880f9d8d9d071e8ae8f678e16a4ba82e19d SHA-256: 7c1dfaa766347f0d3b5f260adc4964e08fab9aeda1712cf12af285ddcf7bcac7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites. The presence of a 'Password-protected archive handoff' heuristic suggests the document's primary purpose is to trick users into downloading an encrypted payload, which is then intended to be decrypted using a password provided by the document itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pistant.ru/uplcv?utm_term=how+can+i+reset+my+phone+password PDF link annotation
    • https://truckforceone.com/upload/editor/file/ragabojotijureterofif.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/wavifoxemoxejiv.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/kefununefitebu.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/jisadaralus.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/sugevipuwip.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/tixabiduritaripanuwi.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210903_1BC60852647A5DA7.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109081927592043.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a5d5ccdbe42693e0f8d7118809a1b505/25879674525.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/82989429514.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/93839677852.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/32838816994.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01f8b601f---44299373290.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109051802573309.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/fodasoxomipuduburil.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/1349313859.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/wizefajeteduzone.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/21887357815.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/mimuvefifakedujaligaru.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/518b6a8409358a763f47d9fcbde23905/51153550094.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/87413833298.pdfIn PDF document text
    • http://school15-tyumen.ru/f/53007020715.pdfIn PDF document text
    • 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_off0000b7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC5 15760 bytes
SHA-256: 0c96aac352370fe8cd7b59ee4ab84105ba36b0458f0f108f1d8e89d7e6e08e1d
font_02_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 10924 bytes
SHA-256: 8975bcb03b7a268033688852f8322ddde8f5c86ddac32d78fa96f464ba65a1db

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