Malicious PDF — malware analysis report

Static analysis result for SHA-256 93afa2fd5e19d036…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 01:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0ad243c84bcc9b6654f7f0e72cab1cc6 SHA-1: d09f4f7ee5e4773ecf4a2c76c26b9ec86d4eec9a SHA-256: 93afa2fd5e19d0366a4cbf30779d443faf525457f992fe5cfcf7a6a9dad4f46b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chp-travel.ir/data/file/wokalajujosojumupiz.pdf In PDF document text
    • http://infinity-pro.ru/userfiles/file/muzuteb.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/42011124432.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be239e7a2a7---feselodixepudimewula.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/f036f4b2dc7c40f58087ca26527b7360/25574818894.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/38238e6e8424ad3921d89078b0479a86/70059092525.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/52347298516.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/47562043779.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e61d5c96be7aec11c956eed6ffbb4f80/49158325040.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7483523da---26671403719.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/gb05770tvre1anqh7ah6e4fk1s/71307423007.pdfIn PDF document text
    • http://haphadoor.com/upload/files/80727643204.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/51dd0e5da0bfc4b7b7263a89e5f188c8/depevuwafesuxi.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/rikekofane.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/20483254993.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc79a332e---gezapojaza.pdfIn PDF document text
    • http://fedoro.ru/upload/file/vinibejot.pdfIn PDF document text
    • http://regcureguide.com/files/files/40893056282.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/fv88kk2olr8kivf3pi04a9u3g2/vusatipetamefiwafewojuso.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b004605c0e1---49789832873.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/juruganutamemefun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cms+1450+claim+form+pdf+fillerPDF 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_off0000d26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 17488 bytes
SHA-256: 04d70d4c32a5e1a5ee6abd6301728823024410a4f866e2b81580bcb90c918ba1
font_01_sfnt_off00010005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 10996 bytes
SHA-256: a97783f92a3e2bf8392ee26f5678440f84861f8106f8aa220579d1a02b20f6f7
font_02_sfnt_off000119a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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