Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5048a277997365…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 00:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53dd3ee158e1b72b1b83a3438515dc4c SHA-1: a32103185e0c1ada102d1cef63059ef76d318be5 SHA-256: 3d5048a2779973650fdf44e4f9e04841082795bb427f39980ae1fb549ecbbf8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of 'utm_term=remote+desktop+via+android+tablet' suggests a lure related to remote access or device compromise. ML classification and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=remote+desktop+via+android+tablet
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/pogusazowo.pdf
    • http://zoo-foto.cz/userfiles/file/22964074801.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/f8ddb911f55b738dc65e1462c1270f07/nutol.pdf
    • http://stoewebdesign.no/userfiles/file/gawonu.pdf
    • https://samsunyapi.com/userfiles/files/50936704957.pdf
    • http://sandlnae.com/data/editor/file/kavademijowinez.pdf
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/77783254011.pdf
    • http://technocom.pl/editor/file/demalefixuwora.pdf
    • http://internet-trade.eu/UserFiles/file/gazovoros.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gdmp80995ltv3dc5gfffb243s4/95713035256.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/92802422431.pdf
    • https://wecareu.net/ckfinder/userfiles/files/16503861080.pdf
    • http://vsrru.ru/userfiles/file/83332026048.pdf
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/88564903091.pdf
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/93314676213.pdf
    • https://castel.ro/userfiles/file/raluxakeridig.pdf
    • http://zjqzzx.com/uploadfile/file/2021091005471573499.pdf
    • https://smg.bid/ckfinder_userfiles/files/badusupojuvedafe.pdf
    • http://szerecsen.hu/editor_up/gewevi.pdf
    • http://stellarp.com/userfiles/files/ridifafedikezigufumexilo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad2a6e954b---rovupusebowadezen.pdf
    • http://uptownfallschurch.com/uploads/files/80418539679.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1ca4bd8d1---gelunidopelukoxili.pdf
    • http://astorandblack.net/emailer/userfiles/file/34246424709.pdf
    • 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_off0000dcfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 16792 bytes
font_01_sfnt_off0000f515.bin
5c35e38797329c9133b8492df625a1da93776911c696a8c96e5633c9aaeb0520
pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 10896 bytes
font_02_sfnt_off00010e18.bin
70430a0e5f2dfa5c0225f86bff6c1c7ca035d558ef27f63ec07b5f3cac032255
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E18 18140 bytes