Malicious PDF — malware analysis report

Static analysis result for SHA-256 54359b8b2514c4ca…

MALICIOUS

PDF

89.0 KB Created: 2021-07-09 07:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8cf793e0c83f1d9e5336601d7f54dbee SHA-1: 47dbcda224b00bc5675c82c00dcf4d0c213afc0f SHA-256: 54359b8b2514c4ca2acc7d455594aecb4665b8393f8eb05cec3ad09dabbb62d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://alphasigmaoverseas.com/userfiles/file/31397793450.pdf In PDF document text
    • http://almar-bus.pl/userfiles/file/tutebig.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/22474612209.pdfIn PDF document text
    • http://ihdbd.org/upload/files/76608932600.pdfIn PDF document text
    • http://liyangah.com/Upload/file/23365477968.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b973bdd726c---tegirujerirudebuwoje.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/54491887695.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/tobuxabarukoserajesitok.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/0c32891e1f6a981fc656d2977c514083/44239504034.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071e52f0bc41---webijipuputuzijoruvanax.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/e8ihkh3gj6ho35j023o8kd25qp/jubidotaxijewojim.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160854bee4a33e---4636358878.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/16471616965.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/rudusuvobepikivazale.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/65373238841.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/16879941583.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/55n1ned6iaqeo6a9v37p36psj4/sadexetusamisejojamiwap.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e115bfd5acb---44899209607.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c1e451eb---ragewug.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/38842991477.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/s22orjl6osdqtig6himmibletv/bosukefaguxivofip.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd3e21ff04---giladaboletunipifex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=i+need+a+restPDF link annotation
    • 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_off0000fc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 17160 bytes
SHA-256: 7d6964ee12c6c6adb286764c9a9dd572cccefea928d21880734dd04691be496a
font_01_sfnt_off000128e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E3 9936 bytes
SHA-256: 5ae125ecc4b28db132eca2a77e7bbc376d529272ccbda0acf0974c43151b6649
font_02_sfnt_off00013ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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