Malicious PDF — malware analysis report

Static analysis result for SHA-256 905fed8ee993456f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-11 10:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3175d57fa74512fe2744e6177a53a4dd SHA-1: 713f1b123e623c4c89c9b5b12712ed0aa64b0c08 SHA-256: 905fed8ee993456f41ef2519a5ef8e29aeeabca131f174895b68790608573e24
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. The document's structure and URL patterns are consistent with efforts to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://crewmak.ru/uplcv?utm_term=aplicaciones+para+cambiar+los+iconos+de+android PDF link annotation
    • https://mywayrtk.com/userfiles/file/dubejurudakilizikol.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136394d0f4bd---binoxegobadazopexubuziku.pdfIn PDF document text
    • https://csn-alliance.com/data/files/7672475825.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/safiwom.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/dezowelolekajo.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/lazupu.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161349585cf194---pogilelej.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/4602086414.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134efbf6e153---fawadabidevazoje.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/domunikutifileka.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/76333234025.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/93071418427.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/susilix.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/52410aa73c18a65f980c742954ba9873/turutexamapugun.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/1241159749.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/74504711320.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/ridekirokexuni.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/73874019274.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/93928474655.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f9a2cef06---55337456020.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/12621952445.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/sanilofuxef.pdfIn PDF document text
    • http://okun.su/upload/file/78169028323.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_off0000cfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB9 17988 bytes
SHA-256: 075281fab95014bd36be8b26eb5fdc186b8476bc8e83ae0dbed57c9716376e7a
font_01_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 10700 bytes
SHA-256: 7685e9868c29720749801b4a254ead0f44976587cf4d46ff889a6a4c191871b1
font_02_sfnt_off00011535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1