Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1102bdaeeb5bd1…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 02:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1abf2db7467bfdd578299a975674614e SHA-1: 8ca35942eb1802c40f63fe16831a902ba34811f1 SHA-256: bd1102bdaeeb5bd1b99f46507b4bf0dc96acda50d22bdfc82ed154d966159b6c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://geojeoceanhotel.com/userfiles/file/20210909223729.pdf In PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/62344612759.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/91745664908.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/zitujuxosunudafubide.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/75878260661.pdfIn PDF document text
    • http://101balkon.ru/upload/files/3128278707.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/petibujoluxam.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/pedutoxugixupoferefibore.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/gipuf.pdfIn PDF document text
    • http://zimmerei-possert.at/53476926970.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/nimozeraloxigajowutid.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/jovulalok.pdfIn PDF document text
    • https://ijpdua.com/contents/files/83114389117.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/pagofudupaxiwebi.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/87635328731.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/1fb75ba8e95cf4b37b3a5c0c5513aa60/51885254456.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/2905a467c53bdf43c6de60987456e30c/80852293478.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/63224533169.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/1d9c674de0daa8cef9ab40d4770fd40e/85777103108.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/semitubetavibekodos.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210914_014409.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/27826787083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=redmi+note+10+bd+price+bangladeshPDF 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_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 11320 bytes
SHA-256: 181306461935f1f472d2189965e75f9fea4796d7d7d413fb5862119a512ac44f
font_01_sfnt_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 19396 bytes
SHA-256: 903a08c02a9adf80f7bd821b4d282287d2f460050edc5f05f528e95a04d8f563