Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd66c3f689a4fd5…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 01:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45a97586f1dcde675527f80aba5ec128 SHA-1: b19852ac2bef27e8f78d6e9dea4512a18b118535 SHA-256: 0cd66c3f689a4fd512befab93ace6be904f5639c690e3b8d5dfcc938529320d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://simonhoirup.dk/userfiles/file/9946200070.pdf In PDF document text
    • http://ldbell1965.net/clients/85689/File/mixujelegal.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/68837875869.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/98944209812.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/47828952161.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffa8aded984---nozosamoxapebibegufibimo.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/79136712709.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/62139497311.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/68635182248.pdfIn PDF document text
    • http://altinay-law.com/images/file/xidit.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/perazebofokuvavajetaw.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/mujezuwefidanoronimiwid.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/9415735be52e3052108abd28c8c5d512/suwajaxozezokogutufenid.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825a8429964---91800701211.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/70396901192.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/tesivorodu.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/9170c8aa11ee3627f5598a39e98a5804/ripitevitekereresuxu.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/oegjj5gerlqud426dfdn4cia47/48092759981.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/72662125827.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/tazuvikidavojava.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/kagirulosesawop.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e59a6dc63d621e6491da8b7e8898bd47/50106558547.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/mixosezefafaruwilufilun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=religion+confucionismo+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_off0000bd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9F 18868 bytes
SHA-256: 07aa6d18f9d568a3553793fc58d56411569f480808d0d39cdbe08bf50a94e08e
font_01_sfnt_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 10748 bytes
SHA-256: 777ac06eb779a1b3cb22a487ad62823d5a5fa63746e0b2249c217d9cf5f7f36d

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