Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d11389275f3c96…

MALICIOUS

PDF

92.6 KB Created: 2021-07-15 17:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ff30c6050ee3a2711e1be5e9afdcc992 SHA-1: 47142f2d0811a96809308e2085c438251dde7843 SHA-256: 66d11389275f3c96080f62f7188338ce7b3932f8aaf9353953f4bf38d8639b34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various domains, some of which are hosted on compromised WordPress sites or disposable hosting. While no scripts were directly extracted, the presence of numerous external URIs suggests an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://soudurelauziere.com/upload/editor/file/41212402905.pdf In PDF document text
    • http://cuacuonanbinh.com/userfiles/file/34634088189.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913080182b6---5394534441.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a721cec792---kunixa.pdfIn PDF document text
    • http://redactron.com/userfiles/file/21544583755.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/xowixepixobipimamozoveten.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/tumufusutabub.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/ca72ca0b5a9768b3190d09dec916f766/97645558659.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecfc328a7b---80632202153.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/e593c372dd2e0c86d79d5f7f572060bf/nusojikazu.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/xodasitixivevibopegibenon.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/tulewebojem.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079952c283fa---gitugidigujopezadabosoru.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/pipadulivat.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/21855941806.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd659de240---5608384897.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc1a3d0004---76342005443.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a916ad619---64655251665.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/592b11918f7bb507644b100528478632/riwujupumufepopovuni.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/apcb4bsmhf19gm5q3jod2pe8u5/81253220778.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/jewilagupojikewi.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/63624498130.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/gijorifolugawi.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/xodemoxuwutoraxox.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/22512780981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=urinary+acidifiers+and+alkalinizers+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_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 10668 bytes
SHA-256: 5ed77d4eb785e89b4c6cd66dfd79f214804c0f7cba6d715a384c9a1592daae14
font_01_sfnt_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 17820 bytes
SHA-256: 31bd3714661959a8b9d7532a1584b0b70462cf4e4a16307f9961a5a10ccbd11b
font_02_sfnt_off00014cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1