Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c1786367937b47…

MALICIOUS

PDF

74.5 KB Created: 2021-09-20 03:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fb605c5ea2b9bd6939c05059cbf436ae SHA-1: a5cac1f4790e79cfaad1734c32605817b5a4d94f SHA-256: 82c1786367937b478ce636c70790d9cd593fc0297b4fd3282238bb9a4cffd0d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to various compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=messenger+lite+apk+old+version+download PDF link annotation
    • http://tochuchoinghi.org/files/pepumotasevizaribomugig.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/kajuta.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/43507951865.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/27931346418.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5b667f108f036961ab4944533562a81b/61818513951.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210920_DF062E209CFFF4A9.pdfIn PDF document text
    • https://magerp.org/upload/files/refaler.pdfIn PDF document text
    • https://tebra.si/userfiles/file/53078573360.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/kewel.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/65510023750.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/9282884411.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/gurulodimovutavuve.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/20617742286.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/35150976470.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/tawazumamagabaja.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/pezuturitilexonofasi.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/xejirizipiwal.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/60396649218.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/sofapimawemawesulozik.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/fawenewenituruvobidew.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b6233e894---41169083328.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad66a9e5c---54434635613.pdfIn PDF document text
    • https://kapefashion.com/files/files/ginivonutidawivesibezuset.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/69940314056.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/zukiwoxave.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_off0000be3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3A 10804 bytes
SHA-256: b98d29c2d06f6049a9334249da5268eb0edaff2d599ee0b06734f9f351351fb1
font_01_sfnt_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 17212 bytes
SHA-256: a9b20080d85be27073a712b4b8f4433823d30aac529f5127148997e037bbb0ae

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