Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fdd7f28de5c4b4d…

MALICIOUS

PDF

70.1 KB Created: 2021-05-30 00:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ade429d046572ca19faf6c7e4034de87 SHA-1: b3742306190f49852b810dd0a97414825ffa3c8c SHA-256: 0fdd7f28de5c4b4df6ed6460cc3350bee2fb6bac3cbc5e37b1dad51c597726a3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160764fbfcf9b9---mobajefimin.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c112c5007---xizasuduv.pdf
    • http://chalappuram.com/userfiles/file/mefodagajipizabalawejij.pdf
    • http://lideparts.com/userfiles/file/1621682072.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c60c8aba5cceec16bb11542e19bae70f/nituzapawemaxefomudaba.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ff20ab808---gevidoravezilupifu.pdf
    • http://kibbkw.com/uploads/file/doxawigiru.pdf
    • http://abimobiliare.pl/pliki/File/rijinulaminele.pdf
    • http://sacoorhealth.pt/site/upload/file/tarukolinujozowudov.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75bd240a4---2797507736.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/23be11878f22f1d2c12e956735bb95f9/xepozuzelusibij.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb4d771ea7---borikoruwizajumef.pdf
    • http://andlupa.com/userfiles/file/86360851946.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160724e80bba02---ketoxuva.pdf
    • https://aspaeng.com/files/image/files/68831572265.pdf
    • http://magendans.com/imagefiles/file/2060208268.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+factory+reset+verizon+ellipsis+7+tablet
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d49b.bin
3b802183437e6bd8cdb459f41c8563f8cb5d7b73567d1fa0e509a18e4c23eafa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD49B 5492 bytes
font_01_sfnt_off0000e786.bin
0a7409540c27ac74560b003dcaee09afdaf9c2ce15aae731f71e4a9ebbe28302		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 10512 bytes

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