Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69010680a0dc98e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-23 15:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c2840d4cb37a3a52b572555ca4b230c4 SHA-1: 3d8e70468efe16b1893b02e105f6c267348e72fa SHA-256: b69010680a0dc98e601bc3ed3152445ac9803f6673928789483afd96c5e379cf
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many pointing to disposable hosting or potentially compromised sites, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://concurs-euclid.ro/upload/fck/41346517881.pdf In PDF document text
    • http://softwarefactory.nl/images/file/miredofijuwefutev.pdfIn PDF document text
    • http://webbolt.fono.hu/data/editorfile/sadodelumaponeloj.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/mijomujobubapijemamimine.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219201053499978.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nebutapotavezujixidovobiv.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147fc00cce40---pogexufewevuvifegegewa.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/69849944626.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/6984370456.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/vapamufufoleluparubepem.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/96521287900.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/42339897459.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/zetemuluzubarujuv.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/56919135277.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/61603055208.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/16327720656.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/41161720109.pdfIn PDF document text
    • http://idcla.net/upload/files/42456264703.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161427c32420a4---36518577656.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/silowukogajeruwimuba.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/68937432048.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5880782c2---98924113918.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210916105012.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/dazabugapin.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/maxoled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=freefire+apk+download+for+pcPDF 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_off0000d07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 17576 bytes
SHA-256: 1bf6b6a06fd67d45944a44f9acb3e90947c9b42c8257422281b0f077110105a2
font_01_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 10504 bytes
SHA-256: ebcdba3d2370db17116080d14f0ccce6bd824823f9238c3fc4dc2e7c8ab70170

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