Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5616701c275166…

MALICIOUS

PDF

78.4 KB Created: 2021-08-04 03:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: df1a3bb535539b41f0b983609ef915f0 SHA-1: a2b348192914fcb31cf750a751311b43e1d6adae SHA-256: 1c5616701c275166566ef361bedf1895b3849e87bc8317c030342d438e2251dc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The presence of multiple links suggests an attempt to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9677

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 https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/cldudrrd2l9ntu3em77812hnvb/29115249437.pdf In PDF document text
    • https://foundryindia.org/userfiles/file/21715977252.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/aa7c1d235f3ec15b33b646ec785dcf53/masasetal.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66795089580.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/kejufofiwumi.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/202bb1d83be29d68b00471f9168f36ba/85411046044.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/gadagulowedenifajakerek.pdfIn PDF document text
    • https://bem-sa.com/img/file/45244293258.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/xugugot.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/meleragugobelom.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607184d03e210---widutojofavi.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/74486325647.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/7825351958.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d918f6f2bdeac54c9ba48cf8680786fe/93774107517.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/divonigifemegival.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///dokurajokorexunotefo.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/sevejuzoxewafuzofopuwe.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/9b228c6d5db528708355511f17dfdac7/jakimodukukoropusuzas.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/68243641507.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01a22bf9c---ditida.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a38a979ead---45585879803.pdfIn PDF document text
    • https://dineflon.com//files/61467405253.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e49bc4bac8---39296086379.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/tosuxexeruvimo.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/24829771253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ejercicios+resueltos+de+balance+general+y+estado+de+resultados+pdfPDF link annotation
    • 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_off0000d236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD236 11260 bytes
SHA-256: 5702acadf6f2c1ebe460314e1804f5f1394db14de90b723bed97b3c881846321
font_01_sfnt_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 17836 bytes
SHA-256: adeb8b1c0a616557182b13aad8726843f96962630d8fd93c8899ee2d1e8df40a
font_02_sfnt_off00011a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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