Malicious PDF — malware analysis report

Static analysis result for SHA-256 9203080fa0706835…

MALICIOUS

PDF

73.2 KB Created: 2021-09-09 07:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f1fcebcc65678ad72983812f1c0571f4 SHA-1: b4de2614796dfd99f0235cfece6ceaf91c39f804 SHA-256: 9203080fa0706835705f7d7f4466e9331a66bfa35789dceff079f1a0774ea26b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://tc-antey.ru/uploads/files/pitamasit.pdf In PDF document text
    • https://mercerapparelss.com/userfiles/files/fiwibirovuj.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/repaforazoruwelafaxizuxa.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613435151358c---lewemivimatukegalux.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210903071706_7jf3rg.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/zapolasajamovemari.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff721cd166---98830381211.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132697571339---59720090399.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/xasewetefegegosaz.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/popoziwixemijipixuka.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/59224485543.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/87301805626.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131d83322cde---nujavepirinuviwixetokasub.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/mglr5s8cgetkh2esf4u7kru2ur/rotozerakiw.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/xuxizijevijonorojifiga.pdfIn PDF document text
    • http://weldingplaza.com/files/file/sozogurakawikul.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/xifegivemef.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/28237808043.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/roraginemosanebavopad.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/daxasinubenazek.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/1524410280.pdfIn PDF document text
    • http://industra.sk/userfiles/file/91084921988.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/50917408442.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/80710423581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=xender+for+android+apkPDF link annotation
    • 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_off0000be43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE43 16264 bytes
SHA-256: 3622fcc1e942c3e5a70731e55c11253e405621b871d03427c21bd871c3595f69
font_01_sfnt_off0000e811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 10276 bytes
SHA-256: e473fc7a17e1f3e80b9f5ffd77d0f665eb989d15b696452790473191d818f745
font_02_sfnt_off0000ff41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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