Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d20737b810198d…

MALICIOUS

PDF

83.7 KB Created: 2021-08-26 10:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 5b988071cbafb6626ef659066bfa4169 SHA-1: 80298c6a843cdc8332daace01819519952097654 SHA-256: 98d20737b810198df7e57b4164deb9577da4b0fef2e9a095542138bd4d4c7406
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads 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 nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://debandhelder.nl/ckfinder/userfiles/files/rudovatugimewemin.pdf In PDF document text
    • https://najlepsze-w-polsce.pl/uploads/61650651281.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/kikofewafuwukabudag.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a9013f3ee---xolav.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/xamofufut.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/095dcb81303e575e2997bdde4d764838/najafagixopirenumikamibo.pdfIn PDF document text
    • http://cichanski.com/Upload/file/duditekesebabul.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/tobuxebu.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/30114631053.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/aca6eee35c88ad5f681d13e507ca44df/tapalemagijamemobesuba.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/q3vs8t2tnrsnqu87dectdqq6p4/lovumodivaz.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec8c1bf0ef---60339633239.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accf95f1df0---ranuvezezebevolu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa14625c79---97686022536.pdfIn PDF document text
    • https://campermagazine.tv/public/file/62710654271.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9nfcthq8tvqou8dpvk7kji23sr/kavib.pdfIn PDF document text
    • http://protok.pro/upload/files/10405089237.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8a5296f2f---8431202909.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cf5eae60dbabeadbe09e56e905d20d2c/samijigo.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/dumofulubenozawuje.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/wivasutiposebovo.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/16421076050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+logic+of+images+in+international+relations+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_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 11028 bytes
SHA-256: aa6380b1bbe8a41410d6255879aab189a0d5a399b3ed59b8bcdd6f573d79ab84
font_01_sfnt_off0000fa5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 17204 bytes
SHA-256: e5b9d376ab1595ab9c5f43192b4b32af8e39b2aa010944afd38643a6b1ef8d5a
font_02_sfnt_off000126b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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