Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f30038e6a249ea6…

MALICIOUS

PDF

89.3 KB Created: 2021-08-31 20:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bdc85cd8146d1e575cacd42404a81c0 SHA-1: 7c20462509b14bec37e780d61a8ea40543aa6431 SHA-256: 8f30038e6a249ea61ab98483442e59dfcfb75de01df5129f9fed402661d3376a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studioguidobarbieri.it/userfiles/files/93288942267.pdf
    • http://josephlillianmorrisfamily.com/clients/59960/File/73363333889.pdf
    • http://bygreenpure.com/userfiles/file/58880196318.pdf
    • http://uhy-th.com/image/upload/files/varerawiximuj.pdf
    • https://bamor.org/userfiles/file/77258671035.pdf
    • http://soepcentrale-dekeyser.be/userfiles/file/20313663548.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ca625734---25000237633.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23102d0f83---31338085274.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/8087954c929436628ee961ab01dd0973/kumifenimeluzikuwadasego.pdf
    • http://logo4you.dk/userfiles/file/57388358120.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872a98457b9---sogefazuguzef.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a553a9e07ba---62625918104.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcb8e82c8b---36044395942.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16094d5a3b1f1f---50723082487.pdf
    • http://akkoryazilim.com/userfiles/file/244347265.pdf
    • http://albino-pitti.com/pub_img/file/75391188368.pdf
    • http://sgo-bage.com/public/files/files/49052863368.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/pg9psiha26fm0unk8ihdup1n8o/soxinibikojujix.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/67266ee6e768c9af1f8880fccaa65c88/62536087175.pdf
    • http://gapoom.com/upload/fckeditor/file/kegopoduruwobodipebojanig.pdf
    • http://n2nlah.org/UserFiles/file/bokivof.pdf
    • http://abwplazaview.com/uploads/files/29558602527.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebca682f4e---xidodadivanejugesa.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/8298f03a3d5c41809a7c8dc11b298d80/loresazofigijanewo.pdf
    • http://nuk-amro.de/userfiles/file/wisasobezepa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+a+diatomic+molecule+in+chemistry
    • 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_off0000f844.bin
f4eef7207dd362ddd452201ecf1d727b3ea99a39a4f25c78592c7924c98d4c32
pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 17600 bytes
font_01_sfnt_off00012580.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12580 16792 bytes
font_02_sfnt_off00013d97.bin
0fbbed12c3e9d1a4ecc00d284cc1eb967ffd74f684d7b365021a71f316bc5430
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D97 10844 bytes