Malicious PDF — malware analysis report

Static analysis result for SHA-256 d181b589f7fbee3a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 20:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 789f24e9e9ec93c66e1a3b2801c221ec SHA-1: 8eb56e345e5cde6024fac7de67a8c51e7f2ecb6c SHA-256: d181b589f7fbee3aa5122b63fecaee9cb85138f5bf363a5da35bc6deb2850bba
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, likely serving as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=ultimate+savanna+simulator+game+free+download PDF link annotation
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c38baa626---87844822451.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/jumafegitewipulevudifumer.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/judosetugunudop.pdfIn PDF document text
    • http://gr-chem.com/upload/files/vixuzizo.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/napurerebikusalesemepob.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/35774008651.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc0d216ec---lowuwazerajazib.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/kijugegekob.pdfIn PDF document text
    • http://186086.com/upload/files/vibizolilu.pdfIn PDF document text
    • https://cape-electronics.com/media/file/lupagoperupajeme.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/34164421086.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/panegugofakudetobawuli.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/zeluvipopukobovid.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5d8c451de74fe17997ccb76503364daf/22711243246.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/4888868176.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/12057379253.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/tilowivujud.pdfIn PDF document text
    • http://dsagco.com/Upload/file/latozefik.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd7b199d5---70915493519.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/10740801845.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/24399985079.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/tenizulux.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/36052679467.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/wegunew.pdfIn PDF document text
    • https://digicpictures.com/downloads/86362464812.pdfIn PDF document text
    • 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_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 10956 bytes
SHA-256: d545c4ffefd09ae2f100e928552fe940224d668aa4f0eebc56a8a6b2bb7fafa4
font_01_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001077a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077A 20256 bytes
SHA-256: 2dcbe8eef89f844a7ddcb2faa9d0f00b6939b660e85fa4527e37b1d022bc5950

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