Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b1cec6bccb81c0…

MALICIOUS

PDF

105.1 KB Created: 2021-08-07 22:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c103310e9b7ac772dd50e2e8ea13736d SHA-1: 6090857563623e3173f763ca33e3c87bcc7f953b SHA-256: 37b1cec6bccb81c06924a1c6252b999b908c415decc0d6c4bd64ed0bae7faffe
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://queure.ru/uplcv?utm_term=fur+elise+piano+chords+roblox PDF link annotation
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a018d250ecf---12344313804.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/ruxogir.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b03a282170---22031757155.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/63113410401.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/41845504695.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/61a8d6657f2cbadc5da7b9b0e5dee19f/wobasasadusi.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608888fb2d9f4---27430798311.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160759a16d0a02---28704976047.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d740bf086e9a35cda37593d6d8d63452/wolumakitikumepa.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160aaac063f7b3---43076086891.pdfIn PDF document text
    • http://www.puhito.hu/uploads/mimamez.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/67881564938.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/vojiwibevaxavuwob.pdfIn PDF document text
    • http://whitebearlakeclassof1970.com/clients/0/05/05755deafc47004aae723e515cf08a6f/File/zejidavifol.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/fd5b8fad629a451ebfbd6cbd59a1391d/3441375997.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/zamunufi.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/zokixowoxawexit.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/59344618328.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/depojufodoxumaxaromiluz.pdfIn PDF document text
    • https://proxus.nl/file/45067843824.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160776e45c565e---44343874468.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dd686790a07---82046363177.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67e3666a23---43619225373.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D25 10832 bytes
SHA-256: 6d96b590ac099a51e6129d4da815d1be7f3f02325cb3b7a2861222c7820c875f
font_01_sfnt_off000135c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C2 16808 bytes
SHA-256: 9ac07318b753ff258aa4dde0aa9fd96fe95649d4d9b8061d05aae7e181bb0d4c
font_02_sfnt_off00014ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000164f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F3 19044 bytes
SHA-256: 944b24909a7cfff56ecb3d2d2e4e6fa7617b06a7c2399ea398640e597fa3e3e9

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