Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81cf09c2103bdd9…

MALICIOUS

PDF

77.5 KB Created: 2021-09-04 12:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7f7ab51573a4f30fa6682b928050137c SHA-1: 2c2e328150fc02027eb30300daba3efd581815dd SHA-256: f81cf09c2103bdd9c47b17643d5d4f736fcd4c5aaf7de8d1bb4946b5c9e22e05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, strongly suggesting an attempt to lure users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://autosaloncenter.com/uploads/file/4929914683.pdf In PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6b096adf6c8a28bf8d2651ab0feadf0f/56878992156.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2413c3d77b52b5114433326aab1fe1e7/59124356723.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/88073584882.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/42050752428.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e906c33374---gorovajudajo.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/mufebubosenewupesegasug.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/36569260377.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3263e3e9f5---10574410483.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/3ptl19igr01h1keesb639rkpm5/riropupezorumije.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f2e02cef896f36e2cf57c5d94bf34b1b/68342634406.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/de9a93b71ce9eb2413e9939f0fe405ec/899996094.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d0118fdb826---gaziv.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/banovalapejo.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/97015362152.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29e7e538db---wasezafifodixasilel.pdfIn PDF document text
    • https://subded.org/userfiles/file/4027794815.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/futibolupafufibapano.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/temara.pdfIn PDF document text
    • http://katheran.com/clients/55933/File/vodilokikusimaromofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=accuplacer+sentence+skills+study+guide+pdfPDF 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_off0000cbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 10960 bytes
SHA-256: a7b24ae4dee6477d02c73cc10bd350855e13c0e645cdd46e3248409a933103f9
font_02_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 16812 bytes
SHA-256: def5e7023774108e30f5d445a05ea2c0c163a910d3d99d7b4e1a182c64effa38

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