Malicious PDF — malware analysis report

Static analysis result for SHA-256 4437cd7a1cb2a70c…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 11:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d1990e974169b31b08d914b14892ee88 SHA-1: 499cba5bef0ca1846973606bb47765e38fcba876 SHA-256: 4437cd7a1cb2a70c594963b5c8104b6faee06d4ec881c0df1d89490a06cfb0b1
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and contains no readable text, indicating its primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://yossy.biz/userfiles/file/20081090781.pdf In PDF document text
    • https://bojovicsirogojno.com//files/5424226640.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1d181df89---fozuzop.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8e314e769d9850e4e63b18df7219413/kativepifi.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd3ce157cb---fegegufetakejiviw.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16093b8373b59f---12963042471.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d4dfad026a1d83441283e33432068637/xiveberozigavove.pdfIn PDF document text
    • http://efrex.cz/files/file/66421578486.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077e4cf0f85c---ximebazatusawozixof.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/qf4jja0tpi2bcabld2no73s460/vuzot.pdfIn PDF document text
    • http://bdn10.cz/files/file/27069893948.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/pafonekalutoxegarodiri.pdfIn PDF document text
    • https://mahae.hu/files/files/fufusujijixatotoretuwiw.pdfIn PDF document text
    • https://red-adlay.com/upload/files/nolux.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/9ce79ce091022ceb09e48890f6ff039a/94015056659.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/befunipegekow.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/35174289373.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5a9507ba0---39462755195.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/zasiwusaxamalikozerirasi.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/6639856105.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/tesorora.pdfIn PDF document text
    • https://latework.cz/soubory/nuwaresogajoli.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/fawuz.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/56698678265.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/19795802354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=gopro+hero+3+black+edition+manualPDF 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_off0000c018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 17604 bytes
SHA-256: 4168f6107a9c1d227e2daceecc17caef2f877a1585a59b6a5656e86482424258
font_02_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 11156 bytes
SHA-256: c1c31de20755373aeca98cbce3c50a6f7ac4239272fb84f55fe1991c4e628c4c

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