Malicious PDF — malware analysis report

Static analysis result for SHA-256 e149f69d2782d48b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 16:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee0095ae0c1775b16e1927f13d1263f4 SHA-1: b3a59fc374def72dedc34f275c2d6abaa4343b46 SHA-256: e149f69d2782d48be36053b9d2d33535e193e4f3bd9250e86135893018a84500
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may instruct the user to decrypt a subsequent payload, a common tactic for bypassing gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=pokemon+ultra+sun+citra+download+android PDF link annotation
    • http://bdpq.hungminhits.com/files/uploaded/files/mimovubisukozo.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/83195105944.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/1150294020.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/85458604426.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210902162731.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/suvelikulisefapivu.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/26010294278.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109091800163085.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/jiwunivobarujim.pdfIn PDF document text
    • https://efnnma.org/files/file/16424187965.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/88950828389.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/tixidasulezo.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/fuzixasusimoguburupab.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161399719adff7---27485424993.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac48b32cb3---batevalawonatere.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/68850801169.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/42111060520.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161342b55dfeb5---24306939275.pdfIn PDF document text
    • https://rosycaffe.com/file/48509674085.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/91756031798.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/3957778504.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210906042744.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/gijuxu.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/34514747367.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_off0000dd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 20212 bytes
SHA-256: 973d856cc82718dd1b9f39c33fdd223632d54c81efb487de5af25015456695e8
font_02_sfnt_off00012acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACF 10812 bytes
SHA-256: 4ae5f434897882705ca09dd627e1e7e5ffdf3d37fff0790d723c0a89876d57dd

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