Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f7780e058e2c4e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 10:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b8dc8474a0005be5a5a5a002dceb1b61 SHA-1: b689a3069ebd0561122d6e54796b3d413a840c93 SHA-256: 41f7780e058e2c4e97219f25b79c568f55c42f93ff68886b910f6c473ec91024
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests it may be used to dynamically load malicious content or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://queure.ru/uplcv?utm_term=how+to+restore+deleted+notes+on+android PDF link annotation
    • http://artattack-concerts.de/files/file/xipawivusiwusi.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/82691240303.pdfIn PDF document text
    • https://wecareprogram.org/images/file/61912382226.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210911_004255.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/72247519996.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/gonus.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/2321338014.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/bazoforol.pdfIn PDF document text
    • http://393citizen.com/upload/files/zobavetogavovaw.pdfIn macro / runtime command snippet
    • http://elma-itc.ru/!upload/files/1887163920.pdfIn PDF document text
    • http://crediramasrl.it/public/file/jefabifulasaw.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6e7b4bc4c---rademiwu.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/kaxonewokafopeni.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/bezamo.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8269319da---bopavojabevesuwamim.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/pamekavejigesep.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/57812274295.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210914102122.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141b25db812b---gadezake.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/8tapmksfmvfq8rj2seq72adgoi/17044538437.pdfIn PDF document text
    • https://arendic.cl/files/luwawoxipabufagin.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/wolilumanebivemoxekupe.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/pagutazawesawilekux.pdfIn PDF document text
    • http://globalnetworks.deIn macro / runtime command snippet
    • 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_off0000d291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 10320 bytes
SHA-256: 72c01f17463f72b6b9e4495c98b924ae53f5435b1acffdaaba5ea74c137434f1
font_02_sfnt_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 17680 bytes
SHA-256: 459beb8d5bdc034604810e1c322de55caa64c9f1d5427482867dc0eee574d74f

Open this report in the interactive analyzer, or submit your own file for analysis.