Malicious PDF — malware analysis report

Static analysis result for SHA-256 0130efda1a382b7d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 23:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00b0fe5a8f82e515be1be8add636b773 SHA-1: 21a2ea04662a4dfda7416f4744a31397e45f1363 SHA-256: 0130efda1a382b7daaf02c78d628df4309aab54815ff38d0f0681ced3d7f3a91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of these links indicates an attempt to direct users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/48eda33f5ccc8461c5d7993801a99e3d/79020267561.pdf In PDF document text
    • http://wsystem.sk/userfiles/files/kowulimutadur.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021052805090973499.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136640b394a6---40264648688.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b7a2c7794---33877302455.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/s970s7tb1l3ds911d8s0jrod22/nesovotu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e4d267ca6acdf6138485341fa82bd887/kapukefotupixuzagenegaji.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b9c623a9a---voxobiragizabupasesub.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/51165177006.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/734b45a05e040b6662e36c440dff8466/96360908323.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/muredolubowox.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df987d2146b---ziboguf.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26e0ed506---vanomenojijutitaje.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/poleroguzapejokidele.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/10747210292.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/54055719999.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/xipipi.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/11808807731.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16120c0d46ab9d---22552713094.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/pk3pka29gpeh6bsmpdnnac3h71/93262315121.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/64863792552.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/8828898668.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cab70c72c70---73377911880.pdfIn PDF document text
    • https://andrejc.si/files/file/10786201979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rc+and+lc+filters+pdfPDF 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_off0000dc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC20 10536 bytes
SHA-256: 5ba24165374bd235a01d720d79bad1d389a568fcb222e2a1ec932c3d91dcfbc7
font_01_sfnt_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 18124 bytes
SHA-256: 07e924d0845843a72376fb820cfde54d873a9a9e3c767d178162c5f69fd12689
font_02_sfnt_off000123ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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