Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6be28d8272c952f…

MALICIOUS

PDF

74.3 KB Created: 2021-09-08 10:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3610630578771b1c004b554e5abe806c SHA-1: 07dd40388c535bc336697a8e6c9d67ec880adb04 SHA-256: d6be28d8272c952f8a2f69646f40ba3f1d8603c8e2a1f83ebcdc5a8525e8967e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://akapacha.com/userfiles/file/26298847776.pdf In PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/83f700b7fffca29283928344b07fdea7/97628723526.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/29vviscoamabc8hubuq3lnjjls/67136208882.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/zojinikisujeriwivupobopuk.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/91818959583.pdfIn PDF document text
    • http://ailizia.com/userfiles/95917291752.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/29090550493.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/22ad0dac196f826f9fe1147fc40f12d1/gaponevebabo.pdfIn PDF document text
    • https://avenue102.com/uploads/file/52516040676.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/09da45d2a4fba003df1aefdd41133a5f/forofitexapidojizidinel.pdfIn PDF document text
    • http://ktcz.eu/files/files/99368824526.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/39e30e3b1eccc758a738ae7a01d35de9/86233380606.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/xevogusepemefelibonad.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b7d403b5bef23b7df037d9bba9694df4/27161382155.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/66026618320.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1b949320c---94046375236.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/tuzinulipaximari.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/20968449512.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/xerubodokedamekej.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/94327265958.pdfIn PDF document text
    • https://equalland.com/uploads/File/8615748809.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/xidepanopatutivefin.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb82212c46---gipiralatepitulefapu.pdfIn PDF document text
    • http://3q1p.com/upload/file/210823150042328127vwcr1lm5yto5.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/bupodigipogosopivarekixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=amoeba+sisters+video+recap+classification+answers+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_off0000bddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDD 11056 bytes
SHA-256: a2cf13b68b52a5196c7c4d140a3dda6ca8cfc2a0ead0706c117352db1a6c95bf
font_01_sfnt_off0000d76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76F 16884 bytes
SHA-256: 4bcf12ddb69d2cd87940dd75ce0fb0e44cef38300540010786fb1ded81ff129f
font_02_sfnt_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1