Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc8a000a34d0c8b…

MALICIOUS

PDF

69.9 KB Created: 2021-09-16 21:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5528617ccaa70f0365802baa46799f71 SHA-1: 47259b8da2e9a18a95f0858514b84b822b0817f1 SHA-256: 0dc8a000a34d0c8be46e73f959cb25f9e20f8fc9e31b26e15eb6e4133ca2e9e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised infrastructure suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=nakama+2+3rd+edition+pdf PDF link annotation
    • https://penmypoem.com/new/admin/uploadfiles/file/13851061951.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142ede7c3972---36318705518.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/zekenojapanuxigate.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a48a0691eae55c35f68c384f8417fca3/widen.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/puvejofedujaf.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/32470073395.pdfIn PDF document text
    • https://digireg.si/upload/89725809881.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/34154411267.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb1d7136c---40171816975.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/2151641052.pdfIn PDF document text
    • https://tigapilar.com/upload/files/ronukesoxekaxo.pdfIn PDF document text
    • http://dges.in/userfiles/file/68096941081.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/36558046783.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161305102c0a4c---dibavesaxosakigu.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/22829292069.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/wasexesivazew.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/posuxexekutakaxonu.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/nuxupilobegupa.pdfIn PDF document text
    • https://mbbs.hr/files/bejupikozitirupumeg.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/56999533245.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/piwanefosavi.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/61586835993.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_off0000b292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB292 10804 bytes
SHA-256: e58fd403d9cbf0ca376f479d9164206d1be42cec9c3d4b9df2b202cf30a226a0
font_01_sfnt_off0000cb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7F 15308 bytes
SHA-256: 87215c6670bfa2096f524453098f80ba0cd742c33b11c2c0a7730e314f34e1aa
font_02_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1