Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf0cc067c0555a0…

MALICIOUS

PDF

69.2 KB Created: 2021-09-18 11:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8039574831ba1d5461cdbe31eb5d5651 SHA-1: 761055553f65712171a586540ea461b2a3939741 SHA-256: 1bf0cc067c0555a08a773f98d19cc128c85a18e21cb97c0d2f126e729abff7c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=how+to+clear+google+history+on+android+phone PDF link annotation
    • http://carnow.jp/js/upload/files/malelogativawepimixobikal.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/43963781802.pdfIn PDF document text
    • https://lesura.net/userfiles/file/potebunozoviwix.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/gimida.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/73527730614.pdfIn PDF document text
    • https://businesslife.com/content/file/20651348913.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/62026706605.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4d7a85cf7b62ea3f64fe228aab45706a/69122059744.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/32611201781.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/dulapekematuvag.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///83332560591.pdfIn PDF document text
    • https://rais.bg/uploads/file/94011076294.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133b356c9b11---75384657665.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/wofokozozejibir.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109041519269937.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b8d4ff80703edba04455f65097910760/6117325700.pdfIn PDF document text
    • https://triosms.com/userfiles/file/roxawimomitozufasofumu.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109080931357256.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210901_DA35505721C65823.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/4625198384.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161422278d6620---10291836770.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/74028988533.pdfIn PDF document text
    • 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_off0000b074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB074 14888 bytes
SHA-256: f31e0adf3c876b50a95071fe1bc780b5afc45b98a832adbaf65c7f5f14686899
font_01_sfnt_off0000d5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C9 10984 bytes
SHA-256: ed80ef8972095598810a431c6f8ce0acebe309d01aa9f69114c49592cb47f9e1
font_02_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1