Malicious PDF — malware analysis report

Static analysis result for SHA-256 795042ccc9d4b16b…

MALICIOUS

PDF

96.8 KB Created: 2021-09-06 08:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 42dd9355940760286ef9db3fce334dd2 SHA-1: fd9006038421963a65357bdd87e1369469f11cd6 SHA-256: 795042ccc9d4b16bede80e64047e3ebaac0643075dd16b76ba6bc95499c856ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://larioenergy.net/uploads/file/popiwawobajalugagugibiva.pdf In PDF document text
    • http://www.pics4us.de/userfiles/file/gekinofugikamibek.pdfIn PDF document text
    • http://domplus.su/userfiles/files/joxesexuvifevop.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba81477f19c---71150141251.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/juxepeduwir.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a72083570c6---86059951255.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/lolanivekefajefibuvo.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/3862524169.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/godiwisudevi.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/55926667450.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083243952c68---dibunojeroxupenodizotel.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/d6b20030de4a241020afbcbb8f60e36e/lugelago.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/2296041705.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/kapexasivaxarezorumag.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/18609434067.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/89392916765.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073867f86720---83023916296.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/67956372023.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/magazovobowojojizunaxepa.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/iodv20semvo18fpa1dqmhdl6b5/gewibebiwuxe.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608010a5cf7cf---58882942718.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/94284750741.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/pulexafedunefel.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/vagunogurogak.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/44995513632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=upsc+syllabus+2018+pdf+iesPDF 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_off00010f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F75 11052 bytes
SHA-256: c74303f706e437bcb67aa3dcff4b55227e2eaaf66df294da64eb07864d00fb6c
font_01_sfnt_off00012938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12938 19984 bytes
SHA-256: aaba0c0af47f8d638949550eae465f0c00b1a8be2992b573a51895ee19fc5e75
font_02_sfnt_off00015c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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