Malicious PDF — malware analysis report

Static analysis result for SHA-256 93efc70063c89549…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 10:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2369ca0ecd8b871ad65f916d9ec000b4 SHA-1: f42872a98ccc9d42f3a98c0448d7d39d767d255d SHA-256: 93efc70063c895499260423166dcfafbbcf7c2d414ebba731d8c9829639bb4ca
264 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document employs a 'Recovery secret / private key request' lure, instructing the user to provide sensitive information, likely to facilitate the download of a password-protected archive. Several URLs point to compromised CMS uploads and link farms, suggesting a distribution mechanism designed to host and serve malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/hnj4bjlta00abjta6mudg4ki7c/faxarimudofapumuto.pdf In PDF document text
    • http://anaminfo.com/attachfile/file/31851980978.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/d90dd856f2a7670299817d9eec94a60f/41439709130.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64957c9d98---mukexabukisitogamidet.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210614065146.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923f6bebdd3---laxuzarunomexogixul.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b28e7d86cbf---xikilig.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/2876598052.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077a2a330baf---kegelotagekugubasi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s2pditef4e8t28e2b3av16ipg1/23362711629.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a330eab0167---92028426153.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb1107acb---38113726407.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/v7hu2681tgvg7hc1kjbu8284od/sofotakokikig.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/8374460499.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/48f4e23ddaf4cbad3aa88e5a71423dc5/kononenekomexobusowotuv.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/38565119830.pdfIn PDF document text
    • https://amblamy.ee/upload/file/5614372666.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/82499255328.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210610132440_g3jfxg.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/jerixunofewil.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/zajireduvekijuzinemomopok.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967b928124e---13931926360.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9cce44527f52070824e1359519536b12/51629508224.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b9aa66f5---73417008132.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b113a6995e---30603319308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+remove+document+open+password+from+pdf+filePDF 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_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 11024 bytes
SHA-256: 1c7ec6963b590f22680234cbd4cb746343e12e5e9442ae7ea21f3762563e324b
font_01_sfnt_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 16884 bytes
SHA-256: 535b9c15f00531fb355462029de35f5d8041585a313f85b404bc1bac6c220986
font_02_sfnt_off0001352e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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