Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49f04cdf0308eab…

MALICIOUS

PDF

88.6 KB Created: 2021-07-17 02:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30a86c7463d7db6905858917772adc65 SHA-1: 9bd9e6b7ffc25d8e50e0a449b2505ca2571411fe SHA-256: e49f04cdf0308eab9d699eea85a125f2e4f9db004ae56469afa2a784db9cfb29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious content or redirect users. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a419dfb4ac7---93859780608.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c27dd3efc7a---dixebin.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d7f212b67e538d1aa105ed7c6c77f4b5/goxuvomixinukamevawuba.pdf
    • https://k-newsletter.com/ckupload/files/16367891801.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608926431bfd6---53672873804.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/tadokabuwas.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1235c6b41---44322389216.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/638b592c47ba11d8bb2321ac28c2eee3/86506890228.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b268a6cfca14653432df464298d88280/bibazi.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc802d0ee4---55547962099.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/rm5n91vu0cn6tp87ahti7uh5ov/81994500862.pdf
    • https://ebal.ro/app/webroot/files/userfiles/files/49981318998.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/f1b5f7d0373513ba4e23684b255c0ef0/xijesovojetamigigotosuve.pdf
    • http://provia-events.de/pics/fotos/1/file/vipefog.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/2861740265.pdf
    • http://esistore.de/userfiles/file/84489548296.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/eq8r9c8ios19j5koq09u21tkcb/vowubafakutasipelom.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/o5uk0he2pnc51rnvc841pgv54q/mikumuvonawamumobivi.pdf
    • http://gramercygrand.ru/files/file/xifipebeg.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607463a851681---45079714523.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/5955866660.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33f593f2a9---tugodidudi.pdf
    • http://bpsstudio.hu/uploads/jogigod.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/d63118a7b1fb42fa04c95b0e3a8324e5/28556888883.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a435d2d2dc9---29509986291.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b460643eb---jesilufilezoxulego.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9fe8f32813c28c6ba5d831334e0a9818/13276377938.pdf
    • http://driver-jazda.pl/upload/file/lowiki.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=beef+and+dairy+cattle+production+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_off0000f4af.bin
d29a95c64de2debb32ed7a36b687d52cb36fe019bcc0475fedf53e6465f154de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 10712 bytes
font_01_sfnt_off00010d6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 16792 bytes
font_02_sfnt_off0001257c.bin
d5ff5d5e70d0906de86c91d06a6fc77abae99b3e378a2434efc67d9a43a12013		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 17988 bytes

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