Malicious PDF — malware analysis report

Static analysis result for SHA-256 58cbe9bc349fde8a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-10 05:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e748f35144181f5b094cfae6743fb2b9 SHA-1: f90dfded0c1b774c1160802aa8964467b0ec1ced SHA-256: 58cbe9bc349fde8a7146b7a2c6aa673dbf28834a0095a787b5b9b67897fbd02e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs and PDF link farm heuristics suggest the primary purpose is to redirect users to potentially malicious external sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for obfuscated redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://inwebjor.ru/uplcv?utm_term=aristotle+and+dante+discover+the+secrets+of+the+universe+pdf+free+download PDF link annotation
    • http://perila-vrn.ru/userfiles/file/98414539415.pdfIn PDF document text
    • https://rafautama.com/uploads/file/11941619472.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/22425835356.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/wepara.pdfIn PDF document text
    • https://majubesar.info/contents/files/33606943422.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/mitoxod.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/f646ac5c6be6e4ecca9c5d0c13431f60.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/64151796806.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/mekogogo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/144f9125a2783daad6290668cb8cff12/63640255115.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/30873724488.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/didizigatutobasokodofeso.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/fc26489571002938865dc52b926a4344/bifatudugupizaginozin.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/20179769184.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393fb7728c8---lagusid.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/4785307121.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/27693226368.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/nusojivilufoxobupika.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/90268902714.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210906170140.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/79617566373.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/dubalifolomasu.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/xudegutebuziwekuwujemolir.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/raberikagotapebeligi.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613912facd7ac---92451204599.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/xudetefikobux.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_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 18020 bytes
SHA-256: f28901781320b516cfaab91f2cb962eea31bec1447b02b13ded8af0eaea0c916
font_01_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 10952 bytes
SHA-256: 6e6da779ad778c26c5581b1bd461b6e0ab6e22c96e67a224235c812980e075ae
font_02_sfnt_off000122c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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