Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e438f4408d4c89…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 20:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a8b4ab9eab14972833d1dd7e8bf5154 SHA-1: 7b2e8db9c6a5070247621f61c3fa74eabdd369b5 SHA-256: 41e438f4408d4c89e4c999cf2405493bbde8d5175db46eb767c594a2f3f710e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://sicilalluminio.it/userfiles/files/77325911021.pdf In PDF document text
    • https://tarsiman.ee/files/file/55847073541.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/dd8ggnb9m20v5eilm5hau4mfc2/60328939505.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/12158105477.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6aa6ae4552---susapiw.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/nazitenidumukubeweg.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/6c91272c6a6da5da9fb23424b88d38f4/paxawetezorib.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/932cfded9629f99d9a1126be1fde9f61/16943960705.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/garevaboseba.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/vowidez.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pepafewimavogumubo.pdfIn PDF document text
    • https://majubesar.org/contents/files/41466887147.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/masetubuzazefosutiwir.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/73070402207.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5cd0b4d2---vatosetibifo.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/34969661022.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba779eb14c---bivilizim.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/jofupile.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/00dea9616ed1bff4325417f4e1f43d94/fibabinigafi.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/mmtc5ceca5n4cc8i230ok7lm02/lebobuxebijokugubegosiwud.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/xovefuwamidezutegapoven.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/viderilipijikabewilejulib.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8p6ug7nemmcdg9t7otd9nc8c0/18874362046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=feedback+control+systems+phillips+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_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 11208 bytes
SHA-256: 7487b1c9aad27dbb6e4d9ec90fbde83269f8dcd029f60589694319ef2650e1d4
font_01_sfnt_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4F 17528 bytes
SHA-256: 726e9be5797bc3fbc327df2a75a3986b33c241e6afddf40fbaace5cbd5835b5a

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