Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd54e2ba4994d5d…

MALICIOUS

PDF

71.2 KB Created: 2021-09-03 23:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a7b050e882b3b212231740796f5657b2 SHA-1: 5b44ec133138d67d5d1ef7ef0a7d832196db330e SHA-256: 9bd54e2ba4994d5d4404322d514b93d37a7f47f30698cd96494110ffa6a2f104
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the nature of the URLs and the detection indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098bfe75154f---sixixelivenen.pdf In PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb5b43e279---bumikupurexumojuxim.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/mirenewujugakodoma.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dd4d7b6b90150221a2327675881fbb8/74107279937.pdfIn PDF document text
    • http://rubensova16.cz/files/file/pimoxobipapez.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/71470077410.pdfIn PDF document text
    • https://kawanmto.info/contents/files/busiro.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/54812289164.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/bagoveluruwe.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/64791033825.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/47722900851.pdfIn PDF document text
    • http://oodow.cn/upload/file/210720231153638953omi98r9cemuu.pdfIn PDF document text
    • http://zeci.nl/im/image/woxijelezunatixatunezuti.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/5913ae8bf1c0cdd58f0e79b9e9b1f380/6691795591.pdfIn PDF document text
    • http://siembra.me/uploads/files/16136957890.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/j7irm7li7he0t2confp9pmpd5f/fawabifasagigozotor.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c645abd4863---loxonaziwema.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/nesevonofamogotelesifeka.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ilo8v0hiio2agdq10eq7b6r3bp/vozonijexo.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/24095916797.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/vojogutegomulozib.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/18426430799.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/xogawofaf.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/gisujafob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=descargar+libro+crepusculo+en+ingles+pdfPDF 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_off0000b5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C4 10940 bytes
SHA-256: 3a11a079f4073da1c5270c9768e0f8adebdba0d865782533f4663034aa1e82c5
font_01_sfnt_off0000cec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 15368 bytes
SHA-256: 8cb0fc7c2f12df41e09a31062baa86f37adb1f81f111ecd09057e3cef326e4c8

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