Malicious PDF — malware analysis report

Static analysis result for SHA-256 2723a8103d3f5668…

MALICIOUS

PDF

77.6 KB Created: 2021-09-03 23:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74889554fadac812e0e3d6c9574b5adf SHA-1: aedd18a892d9d6ac498adda23694bd225f9d649e SHA-256: 2723a8103d3f5668831d5d5109d44df9288180dcaae25e1e6ef674eb698bdf15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The primary attack pattern involves luring users through a malicious attachment, likely via spearphishing, to a site that hosts further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://ergo-logo-bamberg.de/userfiles/file/ripane.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e79a657e18---dugiris.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607abf1b658a0---zakomixegaxijokex.pdf
    • https://aqua2go.pl/galeria/file/rivutoru.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/6bba052af9fd80c696ca31b912a50304/78929319345.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af75c28e72e---gorebowasurobuwada.pdf
    • https://cpc-serbia.org/js//files/78426569732.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/6f9390ae8c28e499b1071d522fff77ff/95856139359.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2b1eb232049de58934f60ad271faa478/97750207342.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/lopemumofitafu.pdf
    • http://ohmamakitchen.com/uploads/files/5762737287.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/29ote9sdqoeqhjp4l643faub02/madow.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/99dc1897a096a5b429bbc84b6ea5e3c8/wafuwafumeluwo.pdf
    • http://commune-bourre.com/userfiles/file/38558531160.pdf
    • http://industrialdevices.in/uploads/74062976472.pdf
    • http://rebizplus.com/userfiles/file/80322213953.pdf
    • http://osteriadelcampanile.com/userfiles/files/70126695870.pdf
    • https://sportsht.com/userfiles/file/jumitejajojojogef.pdf
    • http://1mosref.ru/ckfinder/userfiles/files/61782170950.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/lj397shvuu6f00jna8c3fhq5tc/wabomofadelopamej.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e06cb6f94---debisejekijukiwig.pdf
    • http://hotelgiottotorino.com/userfiles/files/94580579536.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=exercices+corrig%C3%A9s+sur+les+pronoms+personnels+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_off0000c3de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DE 16792 bytes
font_01_sfnt_off0000dbf5.bin
cf5fcbcf709f859db7689ca49c2e621618bc82105ffec33d28b90930aeb481b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 11040 bytes
font_02_sfnt_off0000f519.bin
596151d293f3d7aec9ff84658cd747232d45326b10f8db7299c75f477a08fd12
pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 19344 bytes