Malicious PDF — malware analysis report

Static analysis result for SHA-256 787315bdbbd8866c…

MALICIOUS

PDF

84.1 KB Created: 2021-06-30 09:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6edea9e4fc965cbfc58f1710d9288813 SHA-1: aeaca4c61543e308a4f38da2d88cdedae2eea458 SHA-256: 787315bdbbd8866c505363b5f2eb398d27eea673e7a5a4e160f22f0bebd99a20
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable domains. The primary purpose appears to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://anhuizpyy.com/upload_fck/file/2021-5-5/20210505190636784564.pdf
    • http://ferrogep99.hu/static/media/file/94180883126.pdf
    • http://igabana.com/upfolder/e/files/20210621205531.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b87698090---nosososo.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088e88766be4---lawebolepexabemuzusidimu.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/96299fa7c03c0ddd678d3fb2d12c2bc9/ketukerekuganam.pdf
    • http://faradbox.pl/files/file/56485932609.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084e2ee52d98---63503060979.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07b2e00ec4---kufijigejovuzuzuvatawel.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/f8r378r55hlmnloro7ed2hkdrc/43917412708.pdf
    • http://studiobaldizzone.com/userfiles/files/98226264286.pdf
    • https://clumba-indoor.ru/files/files/jezovuvajuz.pdf
    • https://farmaciasacoor.com/site/upload/file/1591308160.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb592feb9---40722522404.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a6f9813ac---48456041956.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2711991b59---kodetulonikumezoxezebika.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16088747207562---3962009190.pdf
    • http://cleangroupbd.com/ck/upload/files/kosekiturodenesovirofim.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/giloxurowexofusowakola.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16082b450476ec---28404462189.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8728dc00313de33f1c50695f60729170/motufeg.pdf
    • http://ozona.pt/wysiwygfiles/file/12467182047.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/fac90bba6d01f1711c7858e8192cf674/67583865924.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=unlevered+and+levered
    • 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_off0000e802.bin
8942c836daa44ec14dc5302e3c95ccc01d704329a1e8a99188140da987fecab7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 9836 bytes
font_01_sfnt_off0000fdb5.bin
698b3d6ae493d35bbd5c49c8ed53fb98b44bfc18647fa96e0c9761aa542f1387
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 17564 bytes
font_02_sfnt_off00012b72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B72 16792 bytes