Malicious PDF — malware analysis report

Static analysis result for SHA-256 829545d358c67529…

MALICIOUS

PDF

87.3 KB Created: 2021-08-20 05:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c3b5dbe11d838d554287f43cf6aecb6 SHA-1: 47a0edc84288ce2f73dc9c6fb70cb3a72a50b598 SHA-256: 829545d358c67529136943fe8112fdc497e71266a37d8dbfdbcc2fa13f1ed3ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093b0b5b8b4c---xitafilewuzalevawofes.pdf
    • http://dolphinegypt.net/userfiles/file/jurixura.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a83455b47---95527248370.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a64b783a9a---78382957493.pdf
    • http://ibb-online.ru/f/file/nixubexa.pdf
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/63397060913.pdf
    • http://danieldesignpro.com/userfiles/95812414084.pdf
    • https://aduanaldelvalle.com/userfiles/file/86535403565.pdf
    • http://airconbank.com/upload/fckeditor/file/48806474774.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779f4f75a2a---kutuluvapuxe.pdf
    • http://accessiblevehicleservices.com/userfiles/file/gomajuzapibewu.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4c6874dd8---wazamifubodedefoz.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/ced16ee36ed88c29325c6e490b11217c/biwunukeg.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/viknm1i9k2iltbuar47f2mdl90/motebakozonukizewu.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/79449568072.pdf
    • http://kaithompson.com/userfiles/file/zedozugoduxemogi.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160933c8a0b2c2---21846578590.pdf
    • http://elverum-revmatiker.no/images/file/robaduxuwuwasowapadugiw.pdf
    • http://atrsara.ir/resource/files/nixebakowosasatipaz.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/1d2ve4vnt578dgkrmiank24rqo/51300158414.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112a13145ca6---16740157019.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/07a84a0b0638ef1a4176a9462bd72979/dojito.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7bf5a0538c434dc8dfb55511f8868fab/32303946498.pdf
    • http://jncs.kr/page_data/file/20210727220359.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c6fd480b1f7f66b9e8f5e9fe62b37948/sajinilir.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/7224287804.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=accounting+and+payroll+services+proposal+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 16792 bytes
font_01_sfnt_off0001083e.bin
fb5cd10be67cf7a58a26d771990bbcbfb9dadb448340e43e79106f951f31160f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 16744 bytes
font_02_sfnt_off000133f0.bin
d6dcccc90f20eaed53a9a0ca7b38fe5135b0b01e80f931a0f3861bc5950da9c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x133F0 11056 bytes