Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5f15fe5ffcca78…

MALICIOUS

PDF

118.0 KB Created: 2021-07-17 18:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1210af1c79ee08ee82b70b846cc48bf5 SHA-1: c99f7c2148e825e93f4307549813749259c7b6b5 SHA-256: 7b5f15fe5ffcca78a88207404526873afdf2ed961ec4e3d8532deee4a5c55b0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.amedna.com/userfiles/files/17562225564.pdf In PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/46a02ef01950209953f88541f7c7a3b8/29486589933.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/16174434361.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5542ccc02---sexafat.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/54195854497.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/xeroxe.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/wosuvitanipokizijuza.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/2af33635894affb1a582ac07ae9d169a/6627728366.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f36fcffed---3721507628.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c36d8772e---97381238952.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e06436ffe6---bodelamev.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v2d17kcd1gen6l18lm0fi1glr2/12869225418.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/bbea7qbc0s107l7focoid2ce97/zopisasevemalomanasofaji.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/seriwikuwalanikagunubete.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/8c85a272e148400792c6114f07a39661/wodudoxavaxanubopefilik.pdfIn PDF document text
    • http://apcmagon.com/userfiles/20907045355.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/97ed4d11fb58c9e36c8fcb96b4a20d77/42277136027.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/58657728404.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97ec11666---34235934996.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/77564325338.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3e5ee5ec37ba3d34977e11efdd6cc3cd/43654603483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=opera+composers+of+the+romantic+periodPDF 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_off0001646d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1646D 22460 bytes
SHA-256: 3da641fe2380ca644cc694d7857e52b4f75d3a61ee58197f6ca8a3f4f86d4643
font_01_sfnt_off00019825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19825 10864 bytes
SHA-256: 37123d9c4988151f7ffa8469160ef9a933f2561643fae72be4e1905c9391cded
font_02_sfnt_off0001b11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B11A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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