Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95c31d582e3963d…

MALICIOUS

PDF

89.5 KB Created: 2021-07-29 11:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d56b73704f05a12edb07e51af76b6fce SHA-1: f216b7edb1633732dc3774420d8f25ce196e1812 SHA-256: a95c31d582e3963dacfe242c1b21332661e9ef8ef2a05e8f1454b90bae593fc5
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS uploads or disposable hosting. The primary function appears to be directing users to external, potentially malicious websites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=alora+gyration+mp3+download PDF link annotation
    • http://dkmmotor.com/files/userfiles/file/79016151608.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/mefupufajik.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607076086f06a---vujefasubemewuketizeb.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/43462848784.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/19e593e21759b0361403f6ec880e46bd/kolisijoruwukukulunekul.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/1575338533.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a750761ea73---sivepoxoginalov.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/telemewajudotomijoradeled.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/2918723912.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/vewekipozusoraxefitu.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/gojinugode.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/90267503940.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af542414e9---70558878184.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/iqk5au5qtui8v1cdl791ggg5j7/63864380782.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/lelijaz.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607220eda7e6e---kimadowokoxaruwavisobudi.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/titotagojutipa.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/ralabokemepumej.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9833e062e---gijuronuwuj.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/42303443089.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/56905710197.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ddccb4cc57c80f3d8427c21430045ac7/menowevusu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96cac7f4e---82634964650.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/6eef2c158090fa4ddb439d9f69870aea/92053357958.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_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11213 10788 bytes
SHA-256: 070b89c67a76b3b813dffcc955794b93998d51879b2223992dd4f5c49d7f8db6
font_02_sfnt_off00012ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB6 17276 bytes
SHA-256: f1be2b379065364a5b860eceda58bc9abf7934788905d523c3401bcf0ea7d6ac

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