Malicious PDF — malware analysis report

Static analysis result for SHA-256 c159d0a59d691f0d…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 00:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f8ff37411595e09e74555ef032ef21fb SHA-1: e0b1d783eeb43ad895262aeb68a5c5a9e63b35f5 SHA-256: c159d0a59d691f0d3e09c251b78af01160f6a702a6c60b8cc3f555c15b1aeb69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=mi+6a+software+update PDF link annotation
    • http://oxigensupplies.com/shipinc/userfiles/files/vogovobupigibug.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/2878182408.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd4b9a54d---56633393429.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613100c3399c9---kerobotomawojinuseted.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/tiloxuv.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/99260581399.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/zafurelolikikepigusikax.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614887773f052---91611690149.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/binexijide.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/mubukabedeliv.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/99432652129.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/jivego.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/73869439150.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f075890f9d---sawexagotekigowake.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/ruwugibexoga.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/vadigigosixotoxex.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/kofewojovurozara.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/waxoduvotigezi.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/51308951619.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/58663407693.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/tozuvopofosowutapaj.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/rejipuregoradab.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/xaxevonarawivatajekufuf.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA43 15720 bytes
SHA-256: 3f234259f035474d0f4b397802e8bb6d1da932b70177809adf781a38309f1430
font_02_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 10688 bytes
SHA-256: 8eb223439a1a2e3f3918c2add59d746c268dadd2ee7e2b60a372ca3bc490acc6