Malicious PDF — malware analysis report

Static analysis result for SHA-256 8194239a160cb9c4…

MALICIOUS

PDF

79.1 KB Created: 2021-08-26 11:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cc28a8028cba88c2aedf186196fedcd1 SHA-1: 3c994da09c5c0bdb6d20710c27eb0e7ce6da6c49 SHA-256: 8194239a160cb9c442eb90173876d6cd2815d503de458939038b28f54931c043
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as containing a link farm and external URIs, with a high ML score and ClamAV detection confirming its malicious nature. The embedded links, such as 'https://allytemp.ru/uplcv?utm_term=for+and+since+exercises+pdf+with+answers', suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and numerous URLs point towards a malicious intent to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://allytemp.ru/uplcv?utm_term=for+and+since+exercises+pdf+with+answers PDF link annotation
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f516cd70c---jemakikopetedawu.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/74192229172.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/66072088714.pdfIn PDF document text
    • http://sun-tes.ru/files/file/gadanedisaza.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/58334046317.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609308eca529a---pepegiverupu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/29915137041.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202108131213184581.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/rejezig.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/17086901399.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b09f6bfe1e6ad34f6462657604cab88d/47318559570.pdfIn PDF document text
    • https://arendic.cl/files/kibixagoz.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/522cb443cc8dabb592bd3b9cedb29176/75318205321.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/kafijo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a687a259804---60030222325.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e8281671492---64647696313.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084058e73852---foxovozubimol.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b8788420ae2---5150631665.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/efd86018e056d33c58e7d6f6fb4431b5/bupon.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/eef3a6305edd9695a9750cf14b3012f8/befexilunemumigapapup.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/0qiuf6boa3s1hrunr5m5tjd1rl/98094124288.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607806ca888fd---145501774.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD302 10836 bytes
SHA-256: 8bfe0cb412c495e10c32f6f8081e5de6d4201c0f689851356ab8166b61310e4b
font_01_sfnt_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 16460 bytes
SHA-256: 91efecba06c8edeafac1343324deb5fab64f5cdf60be333f2009d2ac37803491
font_02_sfnt_off0001166f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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