Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc6caf8bc023a87…

MALICIOUS

PDF

98.7 KB Created: 2021-06-28 12:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79e1e01486c2f8b1faa99a190ada3058 SHA-1: 0735d25e398435df40d1a1a537255723cc437460 SHA-256: 5fc6caf8bc023a87da4a5d75f5b41c4e6ffe6d073104a2d7829570442a165983
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://designclarf.it/file/jitekutitenupikofazope.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609252d41ea01---20309677242.pdf
    • http://timandlor.com/userfiles/file/zuxumejabapijeg.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73b41ca8d---jazawowatesotu.pdf
    • https://chungcungoaigiao.net/uploads/files/25131718974.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b799128dcc0---nidiledafakibebus.pdf
    • http://ezibra.pl/upload//file/nepaxufujoviwijowekavol.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608f15e67aee3---jazutiz.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609dafa2d9fcb---33304486331.pdf
    • http://intergeored.com/upload/File/77876370577.pdf
    • https://evrenmentese.com/upload/ckfinder/files/momog.pdf
    • http://kaitosushisb.com/uploads/files/nusomimef.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/0015bbf6438ebbd7782970f34c28b812/73805865679.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609193f6164de---gagexef.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/1tpo551qq4ofsv1oj8p5577l0m/pisufon.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/fff45152a439064cc70b5de967983609/gopipusez.pdf
    • https://jamurgoreng.net/contents//files/71733137858.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cffbc44b36---17843447401.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/isn028r4nliucn6ujeldb11i84/84708349632.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/t464jhmf1miajlkmcg4gupftec/fokumaxotev.pdf
    • https://drlanda.hu/user/file/dozabawaxad.pdf
    • http://ranaghatpchsschool.org/userfiles/file/jeginijox.pdf
    • http://peaceinsrilanka.lk/userfiles/file/xonesogopuso.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=global+temperatures+over+the+last+10000+years
    • 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_off00011caf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 16792 bytes
font_01_sfnt_off000134c6.bin
bb2b2afb4bdb6e23ccfcc5f4a4446cdabe91a0ff7fb4305ceae9354e4a68cb12
pdf-font-stream PDF embedded font (sfnt) at offset 0x134C6 10952 bytes
font_02_sfnt_off00014e1d.bin
f0dae9d4f701fd301b18d5f8874662c90c2d303830ececafb30f944ba94912d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1D 17344 bytes