Malicious PDF — malware analysis report

Static analysis result for SHA-256 72360b233df54dd5…

MALICIOUS

PDF

95.0 KB Created: 2021-08-26 13:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2406d377c9d192e6546464d54477f275 SHA-1: 8fa4fd4c21d9e929093ba8ab42343a41d55e24c0 SHA-256: 72360b233df54dd58cb5cbdb78fae4551c90664040f759a89167bd290e34c677
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress uploads and disposable hosting domains. The primary purpose appears to be directing users to external, potentially malicious content, which is a common phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/50gs3c2i9u76k93vpmjtp059j0/nuguj.pdf In PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/43283353072.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/70293738262.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c624ccbf4d70be822e98a75961c99bdf/67335946872.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/67562309546.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/88932482087.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/82673218895.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/23321236763.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/fopajeniz.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/42394828146.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa5a6797798---bumexukuliwexoluwajarav.pdfIn PDF document text
    • https://sanidom.pl/img/file/metipuxuwukuvigug.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9febcee5---kesesudekemuromib.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/98280347333.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/62203528324.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1jpc1f61ltlseofdin2cpm2854/xoribiv.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/34019587691.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/dotupunajozabo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b0078741---gumozepul.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/52562169606.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611981d4107a3---26931965911.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-28/20210528162946698653.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/57729166918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=word+for+male+dominancePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 10364 bytes
SHA-256: 1d1292f4cdb016d19ced795462ef1c149b9aee98f350defab3252f3ed0a5f11e
font_01_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 17732 bytes
SHA-256: 9a2d35347b5492043f975b0c9e2dd1cc76a110ac38d2aec24c1324c6cd480226
font_03_sfnt_off00012a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A50 21352 bytes
SHA-256: 313c4adb808985cde8d8d71ae88f3d966615eebbace7c2a8c26310fe80786ca9
font_04_sfnt_off00015f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F32 2844 bytes
SHA-256: e8524735831b27cc179c3d55077b5c64b8343a153fe07660addc54c0d307d55d

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