Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0277e6655129ae5…

MALICIOUS

PDF

79.2 KB Created: 2021-09-08 03:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7be24f7c7f64fecf6f19f98446da1d7a SHA-1: 5b502bbc3e86a8dc8e69097edcabe81e8a423221 SHA-256: b0277e6655129ae501e57adb9f10d4cb93944b00e3c9dfe9c79ba6cb3c76328b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to various domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic of using potentially compromised or low-reputation infrastructure for hosting or linking to malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chp-travel.ir/data/file/93513609264.pdf In PDF document text
    • http://alpha-cp.com/userfiles/file/gidipolovedisasam.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/8319965276.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/60994848998.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ac18106744a6a0d3019ab13002add550/33054892936.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/45214095772.pdfIn PDF document text
    • https://soechi.id/userfiles/file/sodedu.pdfIn PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/wasas.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fd21cc07e---faxipirupujuwevujokulinip.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608565830d5bb---padotanozitanifuboz.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/2e5a31d7d401a60c399285ab35a133ec/pazarutirusik.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/luberimuvoben.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/pirigasazawo.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/31904596004.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/cq5graa6kjhirr42m3tj7lekd4/bakemudemepulubal.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/n74rt2vd8dqp3p2dl2g4c2dg8q/lofigikud.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/m4jnjo3kqa6t5p3nc9dlahdv4p/nagogejubaxuvejuno.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/wavawuz.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xatepufifamegowidide.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210826114207.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/mevixatudekuxenoda.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/91216452221.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/29983932051.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/benezezuritetefukalefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tannoy+legacy+cheviot+manualPDF 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_off0000d08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08E 10652 bytes
SHA-256: fc5621388ad2f84abb90094dc630a788a96d2168b8b86df1ed5cfb91ad218529
font_01_sfnt_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 17776 bytes
SHA-256: e80bdc3c6c21e99d7e3f15358231f558a093bbd4a2953a856d9be5ba310dc5d6
font_02_sfnt_off000116f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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