Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0699d404847bf22…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 11:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 11a0ee5769f316cf6de8ccac72deaa87 SHA-1: 18ef26a321f5303c8c7dc29185dbfcfbb5fe2ffa SHA-256: f0699d404847bf22d680744ee051eb99001ed9cdf12ada34b67c37713dc3e440
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://cokhihoangvinh.com/uploads/userfiles/file/luzezugokagosi.pdf In PDF document text
    • http://thumpamonpally.com/userfiles/file/75890810448.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/vi940okbmg3e2kdrf3t9d82171/41206275799.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/96962100201.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/15176543961.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c861dfcf6aa---zodajeta.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b609ca9a6f8---73710566504.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/dad7f5da7191ac237345d3f4f375391b/99497625686.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/9bdqassm2it24o0mom038lrv84/19728420308.pdfIn PDF document text
    • http://dfanchem.com/upload/files/46631946782.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b598fa19e5d---bekejun.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609839904d13d---xaxuxizetusezapuvan.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/48257242730.pdfIn PDF document text
    • http://yongqingtech.com/d/files/tajipemujukavuzulugumor.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/27768044872.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/genol.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/bupafigewuzusavetinu.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/juxasukifegisafefe.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/15797883645.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/lgp8jlb1ulkr6d33tdg382efg1/4287398049.pdfIn PDF document text
    • http://capital96.com/userfiles/file/lupaxagodavoputovujabaj.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/0c95k68d8ib0pr9ns5jp92ltt1/xevabizugozopuzikiwujubog.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c43e2da6811---rinagavexenabanewusa.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/butofaruniximeliwekasis.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/liwovusewuvosunusejakal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ap+polycet+2020+counselling+datePDF 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_off0000e005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 18056 bytes
SHA-256: 9a9d33ef35918d6c4c7a06bd8dbb78750088d15ee1f719157d1e5ebf2db5328f
font_01_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 11024 bytes
SHA-256: 83066f6858eb451de8c4a39656141d02ad808e7b9c8b75994ac6a7a9ac13bacb
font_02_sfnt_off00012919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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