Malicious PDF — malware analysis report

Static analysis result for SHA-256 18675e828325cf90…

MALICIOUS

PDF

84.5 KB Created: 2021-07-15 09:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35f02fd9baa5cffaf5210606de75124c SHA-1: 0a3d8eb3c9a219ef73739eef76ce9744d4cd1e8e SHA-256: 18675e828325cf90ff074244c3c0fa4328b7bd58d89829de7b1c8c1ad68128d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=knowing+numbers+class+6+pdf
    • https://tims.ro/ckfinder/userfiles/files/lekuvujudubake.pdf
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/jofigotixuzawekow.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/aae0kj6v4hsstmhgasfn1klj0m/likekuw.pdf
    • https://newtech-utm.pl/userfiles/file/34122712136.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e4325839c---59439032989.pdf
    • http://aucoindeshalles.fr/menu/file/lepeledibeka.pdf
    • http://poltinik.ru/userfiles/file/mupijaganirasuj.pdf
    • http://tafoto.de/img/upload/files/rojepapeleleduze.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f059c60e4e---56679120357.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6d4322fe9---17970884142.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160986be38c714---59725711822.pdf
    • http://jnnycc.org/userfiles/file/47406283255.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/akn37orot3ohgkata46ur09v30/vagedamuzegomumatoza.pdf
    • http://micronforgacsolo.hu/UserFiles/file/82399878573.pdf
    • http://nguoigiupviec99.com/webroot/img/files/65098424805.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a506b9618---batuzutefizitomezufefa.pdf
    • http://www.nachtruhe.info/up/files/busekedigamidijogoferuw.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38b08331e3---10307734273.pdf
    • http://maydangson.com/vietkiendo/upload/file/57404330978.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/a022ff7fa97ca59c5f8d13b020a4dd93/82639750887.pdf
    • http://naturalmis.com/userfiles/file/jevale.pdf
    • http://fence-alarm.com/userfiles/files/zosez.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11b1a06d1---30151521807.pdf
    • http://cascinamana.it/userfiles/file/92158404727.pdf
    • http://sns.hu/_user/file/93262139224.pdf
    • http://langmypham.com/luutru/files/93164597690.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa44fe3aea---68230269167.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_off0000e4ea.bin
2751f1c2d8b7808f83015fa301de30a0769eff1b48ee63a2e2fc51f5d31f00fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EA 17460 bytes
font_01_sfnt_off0001125b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 16792 bytes
font_02_sfnt_off00012a72.bin
8395f65b6a7d5dd008b19bfafc63fd366bc48e28f26ef2f744827a0ef8d6b0fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 11348 bytes

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