Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe503328601c1b63…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 17:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 85dd4af160a6455af2f8d867c2a3c0b0 SHA-1: 90f31841d32f953959556db4a3da360186f7d627 SHA-256: fe503328601c1b632f86de1f08fc7b856cc0b01211dd211e9e4ace468b60dbd3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. No scripts were extracted, but the presence of external links and the overall structure suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://areicon.com/images/file/12741430396.pdf In PDF document text
    • http://haiqi-machine.com/d/files/95494639390.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/975cf8a0512952634d1da0e4ebd56500/fuvadewabizumerepabajov.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/sanijasejulilurafixid.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072aab303b5b---70041361191.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/10756130644.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4aca77ceaf---36967744402.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d0140ad9f478f8eea4bf343d2ad8dc68/81836671255.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f923d3a9cbd---71973199119.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa646e624f0---25049307377.pdfIn PDF document text
    • http://specimport.by/files/files/biliraxo.pdfIn PDF document text
    • http://vejwun.cz/images/lazepigokod.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/34804914070.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867bf622626---33068502306.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a695624b7e8---kugebum.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0cec03bc---vazezipate.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160fb51bd42b9b---runibolupadamegusokur.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/wiveronavisafunozuke.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096636254af7---66941870877.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/48976470100.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/c54a64e5910d59ce101a418cd68c771a/20386365628.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/35023052750.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081d65ae1f41---jipewojaseni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=convertisseur+pdf+en+word+gratuit+windows+7+en+lignePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0a859d8dd60c419bc0803064305ec508/kikazedakotil.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_off0000e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF871 19448 bytes
SHA-256: fa375cd1593f234f6382e7a19bcac1bac546e28d6f147fdb1d39079695c8e47c
font_02_sfnt_off00012991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12991 11008 bytes
SHA-256: 097035bfd8e209199fb88238c062db53e358abf81486b8d4a47599ca923f012d

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