Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0c9f08c313b4d3…

MALICIOUS

PDF

88.5 KB Created: 2021-08-18 04:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28450e900126ba151be836beeeb9adde SHA-1: 1fb825c89ab909900da9d622e256894ff645ca49 SHA-256: cd0c9f08c313b4d3ba5c387c0eaa3b28c491d69cd0f02abfdac566a8997ce650
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://birsamundapark.in/userfiles/files/fejujosuz.pdf In PDF document text
    • http://mooneyes.pl/userfiles/file/72914032222.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/jisedat.pdfIn PDF document text
    • http://chikatere.com/Upload/files/fekemu.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5565d1c4---seponinesixadi.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/17999590558.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/91905003293.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b43cb2bf7cc---66533714329.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16099833592b04---defatemolasotawojomuvote.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/kabid.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/gudiwebizironapomuvipaw.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/0v42f7l1rk0luin7u58qvi26ae/40129620142.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/20150634657.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/06ce75b1f0686becef7297d9d588499b/24175482126.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/ecbc99c55cedd00468dad8bc5a654e20/15898732986.pdfIn PDF document text
    • http://rubensova16.cz/files/file/nowikarixip.pdfIn PDF document text
    • http://peoriamayorprayerevent.com/clients/1/16/166e3f524b51ec168ebfd48f86188a1d/File/ladufenubizamibezu.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/941d426e03891e0922d0ba89bc7148c2/wuluxed.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/lumakapevo.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/838161974.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb5b59d3a1---95373261875.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-25/20210625055144385620.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/76364467068.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ff625068d.pdfIn PDF document text
    • http://jp-cable.com/d/files/jifemujozupuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=biblia+hebreo+en+espa%C3%B1ol+gratis+para+ipadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 11072 bytes
SHA-256: 754df9259dd53079793440ed1905d3d24db3130657e18c89edf761e8def55921
font_02_sfnt_off00010bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BED 17716 bytes
SHA-256: e11dd2df4c2876f0847bff8b384fb52509d07c4c41d440d65660c2be0980932f
font_03_sfnt_off00013960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13960 16848 bytes
SHA-256: 426208fa4224153d9fb88a8a94bf655176e48ac28bcea52503e12ce00077ca87

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