Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8c5bc024d1e540…

MALICIOUS

PDF

70.7 KB Created: 2021-10-04 04:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3d82e549e1754a4c1bbcfc169a23cdb1 SHA-1: 698f8e8e7e2c35a0ffdd983fe42a4bf33bf3f32f SHA-256: bd8c5bc024d1e5408708ca746c7dd85b03189797958b8f06207c98b4a5d43346
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly flagged it as malicious. The structure suggests it's intended to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://coretry.ru/uplcv?utm_term=bitwise+and+calculator PDF link annotation
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/24108d7e3f75f6f5d324878cb350e7ec/bariworegogezisabil.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210914171445.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/80280362183.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/jutetaxotujixefakivuvidek.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tixorew.pdfIn PDF document text
    • https://kapefashion.com/files/files/luligofinagetefefejijivow.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613185011f249---24553853548.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/73061342418.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/fasob.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/megogotikutavugukikawusub.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/79969851819.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7vjil8765plh45dbi70ad8lrp6/2963211494.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/tudufemigaladalop.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/lojesexalibalibazol.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/siremoponiva.pdfIn PDF document text
    • http://tenis-klubmoj.si/uporabnik/file/bozinogesujaxirazunuka.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150d12492bdd---9945697152.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/zajiluvirumuxelud.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/xigomobuxo.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/xozepevufumome.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/vepobewojusibodo.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/85068197586.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/fef6e840e4deba6f6b4298f9af2cd21e/25093582692.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458a70be2bd---77793075646.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/24653545382.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/xometulodudalamotedan.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_off0000b4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFA 10604 bytes
SHA-256: 4086dfd9c291cdf13864e6d0653ea8a5f8684331d2ab32a6ea42d71bf0c7767f
font_02_sfnt_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 15672 bytes
SHA-256: 6e9a7ad6f74af4c9c6979fe9c89e037c8fe7bb162d6c3e4231c04d747b76ac32

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