Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a4b85b5e0cd6c3…

MALICIOUS

PDF

88.6 KB Created: 2021-09-01 08:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 635a25ddd11bb186d8b7c7f1007aef4b SHA-1: 5d4deb41572989b412aa543c3cb52fe7156486d7 SHA-256: 36a4b85b5e0cd6c31f320551c6b6dce714829f294cbfe6a75123411c1b3b3f86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://vervesimuhub.com/userfiles/file/68702449599.pdf In PDF document text
    • http://maility.pl_adresuserfiles/file/72127088187.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/vopodekilaligonuz.pdfIn PDF document text
    • https://rajakedua.com/contents//files/mojuxobem.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/junupizurepivikipu.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1622140469.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/10351771749.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/36695751485.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/48721357639.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/le98671rqnc02erfbf6otrb54t/kavuret.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/99936896906.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/61663947042.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb37ab078b3---muvowaxipigo.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/39945363880.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/90693791024.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/3647a61bfb7bad1cea5a9374a7c45a9d/98948774010.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rjv9vi0fclqpimtthgeljg5og2/gebokasomazajirobe.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/visaxakox.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/157a305d80b1b7fe3624b4c357fb3405/xorutoketigujabosa.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d9046dfcc---96936622809.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/21498212669.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607915f038b74---nerokenubufometos.pdfIn PDF document text
    • https://cafesca.net/ckfinder/userfiles/files/bimafadoso.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/meguvajinowore.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b924f4d4511087fa6364e013450ebe80/54657090100.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16124ea8b1634c---25849629246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=twitch+chat+stream+overlayPDF 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_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 19148 bytes
SHA-256: 54fd813235783829f57f42bab5097e5fe432868f97cf7b3578e48e33798ddf5d
font_01_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACB 10620 bytes
SHA-256: d907edfd080fd81f55ba1c13989041de44fbbdb0cb26a31eb97782c4172033a9

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