Malicious PDF — malware analysis report

Static analysis result for SHA-256 403b091576003d62…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 16:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0780ff43364736dc533b68c0403fc48 SHA-1: 742b65e2dc3c6a90f6e47aa4fe9efc802f200319 SHA-256: 403b091576003d629d7c44805318bf6a9e2c47a93aefdd70b5f3a820bdd6e2a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The primary attack pattern involves directing users to potentially harmful external sites through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://vet-arrighicolangelicristilli.eu/userfiles/files/ketiwojogilezevab.pdf In PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/tepopubuluruzugokava.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/f05qo1kjp9u8jetpmlqmsruelf/pinepipenubipumivufez.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/60230378197.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c9f8ae9be---vegewadakukugobibokoxilo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c043871eed3---61771340903.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082de625c95a---67749272041.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affb7abf705---rosawofibuxabor.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e97b2eb80a53f107c6680220429c21cf/bavadopozufuwabisa.pdfIn PDF document text
    • https://webhosting4.net/media/file/90875190737.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d3a4495851---pimukexetefetodikubuniju.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/67616098183.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/501bec229100e21bf708f08552fadb77/69063755773.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ada8ecb9770---pefotitozobo.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/bupilizan.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb86a29983---51702462191.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a91d92c170e---geditesalawelexegobenuk.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/wibizojamonotipolunikixa.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/26839028013.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2035dcccfe---60225774850.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/9e73096e03a2568d9b76dc7b0d08e851/gedawazopomavipesudixeku.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/fonoxopijev.pdfIn PDF document text
    • http://amandamaitland.com/images/file/wuxelikalegurogumuzapo.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43420457a67d4c1466297c624324e8b0/mapuluremoketif.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/nelujozajovamawerani.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1626118061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=present+simple+vs+present+continuous+story+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_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 10900 bytes
SHA-256: 383d48ba9ad15fa2a79521319e75dc124edd63ee1f792d66fa0b3b4ec1422790
font_02_sfnt_off00010d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 18712 bytes
SHA-256: 391afb6b6dea39d0953257f997ae17a7d863ac9917201cb402256c23e88e4ecc