Malicious PDF — malware analysis report

Static analysis result for SHA-256 af81458367c61950…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 13:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54a3dcc66261db1e0a8ca94243efa08f SHA-1: ca7adaccbad437ce3521d6a28e04aec1d8828d7f SHA-256: af81458367c61950a41676642468430c0b43c7ae505bf6bf2e9b8ee32b47aa1c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicate a link farm designed to redirect users to malicious content. The file's structure and the presence of many external URIs suggest an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://geose.ru/userfiles/file/97556278052.pdf
    • http://hitecds.com/userfiles/file/17732465131.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ed2d6397e---27987550465.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/e80mpvhfct5km0i7fus8d7jvtr/sanalolokamowagaf.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a992bdc215---mojovazaf.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f604512fdc---96204026983.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777e6a54af3---fetalulosopirek.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/sdfc8tdaa15n10k25a304bff70/7450639896.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160971ece63e7a---dibonetugiravolemikego.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcdfc51d6d---30030334464.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7aeb9aa17---dizebalajunun.pdf
    • http://iehyun.com/editorupload/file/77560620670.pdf
    • https://gute-reise.ru/i/files/files/paxag.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cadb9dc45efa4132927eb7fe08867e35/54629260110.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bcdb8a4ef---sodanuwebutufowo.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/3c7d187256a3120f84ccbb6e7b0d457b/gotojibobusef.pdf
    • https://samarpanbharat.org/trila/userfiles/file/23080865878.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916c87e5db2---voxiborurisanitogu.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160d377be1818b---derogikanipake.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/1705c7b08a23dc615c7f5ddcdff77aac/57072956178.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb3c48b3f7---tokolokemope.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/voramodimitesavewi.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093bcfca9611---20834443513.pdf
    • http://ersatzmonitor.de/userfiles/file/vedaw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=money+and+banking+class+12+questions+and+answers
    • 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_off0000ee63.bin
ed84b89d3de7b1d01d7a51301b2eb9bc12ede9d825b49f62636c1334196289b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 18080 bytes
font_01_sfnt_off00011d8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 16792 bytes
font_02_sfnt_off000135a3.bin
37e1945b2323030033c8b6466e050f8f5f1af9b810b0891f8b1223437fc6eb26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135A3 11388 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.