Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9a2fc9b080e3a5…

MALICIOUS

PDF

85.1 KB Created: 2021-08-31 11:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89597fc393a5d141fcca9fb9ba5be44b SHA-1: 75e1d81aa745f8baea72828335fc5b9fab158310 SHA-256: 6f9a2fc9b080e3a5b36f17fe617035e2d43c74dea06917d7d0f44df4fadd7499
172 Risk Score

Malware Insights

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

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, directing users to various PDF files hosted on potentially compromised or disposable domains, likely as part of a phishing or malware distribution scheme. The presence of invoice and download button lures further supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bygreenpure.com/userfiles/file/19121047316.pdf In PDF document text
    • http://ytbozhuo.com/upload/file/310507113172.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/24999941196.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f6646fbfb373820ca9d298753e397f54/siripifavoxanexedak.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e3e366b15---munazajiniwalozurigagu.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161044a35d9f7c---44962339877.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/fozaliwujotiw.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/36589668706.pdfIn PDF document text
    • http://amesonsofallen.org/clients/53156/File/dukodiludepuvetusilarep.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ce8dibe2a6bsvmd9v6fagp62di/puxev.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/fupem.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/28194694907.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/77269052141.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/18626399704.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608365aa2af6d---14001144.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/9fe7c483a9c1f9793228c72c5e68a9d5/16082641378.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/lipanukuweximukubareso.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/ziraribe.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/najimo.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/wadotosefoseno.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/55732181168.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e59d9e974a4b58c5d2d3a7d88e46b000/43706155202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=theory+of+machines+handwritten+notes+pdfPDF 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_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 19084 bytes
SHA-256: ce81b634e1d5db1b5641c15b8d357b919755539f51388fb188e7541963f2e5e1
font_01_sfnt_off000114f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0F 11000 bytes
SHA-256: c323a2ab0e525e956dc3a4d28d986ac2cf05fd3e6439b7eeb6c7aa8b520eff42

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