Malicious PDF — malware analysis report

Static analysis result for SHA-256 419595b26fe8e5bc…

MALICIOUS

PDF

82.5 KB Created: 2021-09-23 13:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ed86e34cb2d74427c85b002b6ffa2f7f SHA-1: 65ffe9c4f9c5abe6eea8c94bf5bb7ed4bfa27540 SHA-256: 419595b26fe8e5bc6fe24af3c75092c061cdd21b3cc4db841eeab5ed689d80ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to facilitate the distribution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.rajpuc.pl/pics/file/konuzewerokasovogotox.pdf In PDF document text
    • http://openendrep.com/userfiles/files/tisozaxepuzadabumejilo.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-9/20210909061908114797.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/74746170583.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/wofobu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb6ec5e43---zabefafuketarexizuwo.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613df61e24d02---47988875318.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/95619926433.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/020727bb3fcc89915578fed067f7b25d/83835480750.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6fba96b84---gubazugibaritu.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/89277168905.pdfIn PDF document text
    • http://tochalco.com/uploads/files/53879683837.pdfIn PDF document text
    • http://envigest.cz/upload/file/64397780018.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140456e969b1---39221942666.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/42764911925.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614a36e014266---joteza.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-9/20210909195727632852.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404d6289b73---kaxiwilix.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/defajanuja.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/zejuxufepewideze.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/gewojelebizizaj.pdfIn PDF document text
    • https://cardolf.ro/files/84182732607.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/24436484319.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/bobimofebugifapomapumobab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=elements+of+art+line+drawingPDF link annotation
    • 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_off0000dfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD7 10764 bytes
SHA-256: e1a640a86da94c6258b96c791caad50ae3db6cdcaec849852d080b0a5fa419e8
font_01_sfnt_off0000f86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 16804 bytes
SHA-256: 0ae49e0c94bd2fb81c668023701295242395c6d357990bfe7a7f8969243b3fa3

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