Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38b29af63796bbf…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 20:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3de78e222765a7459ed95b76e757223 SHA-1: 53eb1a13a0f2d5fb6a11c2c4691048a8ec901730 SHA-256: d38b29af63796bbfbafd6c51b6055fd547b5171a517b1d0ea17af0cfbe999b4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=how+to+find+wifi+password+using+ip+address+in+android+phone PDF link annotation
    • https://emmaushuis.org/pages/wavisenexalazafes.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/pogamuda.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/vamoj.pdfIn PDF document text
    • http://rem-proekt.com/f/file/18330137088.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0e287f24e---wewosuzedewareguxut.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136b42d617ee---62084199124.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161464c24604ac---10007565402.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/rudelitexijanotofitebe.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/kedunuwinakodedimofat.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/83782950352.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210917001451.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/30055822756.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/nofugozu.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/47649630898.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/k7ga8ufspof46pm0itcamikg20/5099694933.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/93108057806.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/kifulubodixutasagemir.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/zetukidebugorikago.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/61856590154.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/wozumujimonaxafenemoluvix.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/31743621381.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/sonibidugo.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/xisoxezuwujusas.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/zazuw.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_off0000d3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BA 18332 bytes
SHA-256: 39d44528019602076ade1c15835069959a0a17ba43771cb1f82accd6ceba67ba
font_01_sfnt_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 10908 bytes
SHA-256: bb6d9da1e8a543df81ab1d28d079fcd673d46810a9688e865af4b0618591039b
font_02_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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