Malicious PDF — malware analysis report

Static analysis result for SHA-256 a336af03fb2c244a…

MALICIOUS

PDF

75.7 KB Created: 2021-09-10 02:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c4b6a16057749c68e6fde071c5346c14 SHA-1: 8f0920363d75c0a617973533664ff954d1ed7f17 SHA-256: a336af03fb2c244aebbcd06ba77b343687617534787dd7c6d374b77621a7600c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of 'utm_term' parameters suggests an attempt to track user engagement, common in phishing or spam campaigns. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=where+to+download+tagalog+movies+for+free PDF link annotation
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac1a6e5fd---fumozokuk.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/vujaxewi.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109100607029532.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/63707552785.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/35973516487.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/vokazegat.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/bexotumuvoza.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/vekaxibot.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/76659223169.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/55840463142.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/62788710679.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/64259693855.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/dokelopejotulemokopodexo.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/51682757128.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/80581803134.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/52838230772.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/bapidapefunogubafifozo.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/gefiwovepute.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134950e5d009---vuvetepirebi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b1e6f2b80111c1fef15d772bffef2f4f/81027503823.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/45922497405.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/remefidodi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161329068973bd---zosaxepapelenuva.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e370ead269c05d4c692dcef0519baa32/xexojorerovapixorag.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/xepiverusixufomokubasexe.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/20048465778.pdfIn PDF document text
    • http://novafish.it/userfiles/files/duvukuzuramopulaxoji.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_off0000c296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 17488 bytes
SHA-256: 8a80646162c7dae5b41f7194ae7e3f324709b3c7fa7dcbd2993341cfb6b50f5b
font_02_sfnt_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 10944 bytes
SHA-256: a27b59b8fd610d940eb7d2bb3d625ffaad2ffe0296c39b7fce724780c1449c6b

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