Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b621d54077051d…

MALICIOUS

PDF

68.7 KB Created: 2021-10-05 02:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a4be571d0cf17f1642074f4c403d47c1 SHA-1: 9374b99e28c64a961fbe844958c6510f366dc403 SHA-256: c4b621d54077051d0ab12bf85eb1c5dd2a8ee40e95e3d21a9a03f04ba86f2f47
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and ClamAV. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The PDF structure is malformed, indicating an attempt to exploit vulnerabilities or hide malicious content. No scripts were extracted, but the overall pattern points to a phishing or downloader lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://huntic.ru/uplcv?utm_term=code+lord+mobile+2020 PDF link annotation
    • http://tidomusica.com/uploads/files/202109140617167290.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021091210121273499.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a70df44237---jimidumimimolatobi.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/levitapowoziserud.pdfIn PDF document text
    • http://demkapi.com/resimler/files/32110631167.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/gewuvezufifevebugodulef.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6858f08b6c28591050b3cbd4d852b5be/77643487661.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ogt9e45jvajco42su7s8p8ds43/sedezelanozofuxunuxiguji.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/matidopetojajifugudoj.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/rawilixusuzifirabizo.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/mejulufijusuzujepodita.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/86559729941.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/227015733.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/87798934830.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///tiverezojafozozavalo.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/pekobuw.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93d10fac2---zigubinotatagipaxavapu.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021914728127177.pdfIn PDF document text
    • http://dejonghenico.be/sites/default/files/file/givefojamat.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/gemajoluzexiboze.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_off0000afde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDE 15280 bytes
SHA-256: 735022459636c356dd2671a143721a4a0cf6c06a8de568a478bed2d0b2e55828
font_01_sfnt_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 10288 bytes
SHA-256: 2dbce157fac4beaab4e9935d2744202b381ff108e65fba6a508d9f4374636c64
font_02_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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