Malicious PDF — malware analysis report

Static analysis result for SHA-256 15fb57afbb67ca90…

MALICIOUS

PDF

85.5 KB Created: 2021-06-25 13:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 919571fc72194b537fa81e16a5b90fed SHA-1: 4d229269914252135de979ce9531def443a3bbe3 SHA-256: 15fb57afbb67ca904e3413627fc2191f17bc98de0645d9f49423a2c2b44bc124
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 installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.kilincsweb.hu/fileok/file/40561667670.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b5ccb3e68---xivipezusolefegezorug.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ee17e585c531b206587df7cfc8aeee16/6050406724.pdf
    • http://uni-farm.pl/ckfinder/userfiles/files/59834939106.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dadb365743---zowemenutib.pdf
    • http://lateonsettay-sachs.org/userfiles/file/minibu.pdf
    • http://extintoresorigen.com/images/editor/57054086681.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/3e1076f51eb7580998e26d5bd32f36b8/natekudidulugeguv.pdf
    • http://akicgiyim.com/userfiles/file/bopefolevufabiw.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609600a1a7a4c---ziputijasilebuxo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57fa49a765---vetiwilibitexe.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8vdldblnvtltq7s9eklh1am4g0/xevezurawoxiwezosoxabilo.pdf
    • https://baxsporthorses.nl/userfiles/file/fezir.pdf
    • http://curry-box-deluxe.de/userfiles/file/gijebomogetudow.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609430f474f4d---kapazavaxinupuwilirixuz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=practical+atheism+meaning
    • 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_off0000e95d.bin
82df13af3aee16987e17fa1781eae8387093e29ac1d3f63b5b25fe0015f829ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 18536 bytes
font_01_sfnt_off00011986.bin
a59e00e01f9c5ab1ca337237b01f71f5e88a373c77b4fd361f028a4c5c20cf7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 10556 bytes
font_02_sfnt_off0001315b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1315B 16792 bytes

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