Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f0b67843e86132…

MALICIOUS

PDF

76.2 KB Created: 2021-08-11 12:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 551b27fdc6fb463fa77bd88a665f4cdc SHA-1: dcd356dc76e42a9b8af224d0a3621ab405f4d459 SHA-256: 93f0b67843e86132672347c356c4152830d1d7d00c56d6f2dcd228742773ab1c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alituncer.com/userfiles/file/11413144894.pdf In PDF document text
    • http://generaltubi.com/container/ckfiles/files/bedamepufijekem.pdfIn PDF document text
    • http://gewald.ru/content/Files/26225084952.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/xuvikojup.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/jejepo.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/pumol.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3900891fdd---suvetibajeduwezifu.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/70490810960.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/4605249500.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/86051520320.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce85fed143---42668186467.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/182024194142.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/femubi.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607060ad73c41---16039879267.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/57788056302.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d307336f080c278108142d61419c0f7c/55357533080.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/99045502e8eea546ddbe5206bef3b28e/41630467501.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160abf74f72093---52753785981.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa37868d04---42137529670.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/35411911645.pdfIn PDF document text
    • http://contelex.it/userfiles/files/kodadupakogimotaligeji.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/20148291103.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609c91071ed68---84256539161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bahishti+zewar+book+in+english+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://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_off0000c510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 17516 bytes
SHA-256: abf4bddbae9638a8c89b89f1a81f9cf4c1692e00b95f09006e3426895981fdca
font_02_sfnt_off00010b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 11208 bytes
SHA-256: 110085a78b073ea187e00389e30750dacd29d4f668f7462979f5954ff4c0583d

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