Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d303fe7b903600…

MALICIOUS

PDF

80.6 KB Created: 2021-06-30 21:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d1e9bbe40757158ec87b71f8a87d1900 SHA-1: 3f7dc17d0e29d9fe9a75cac7089cfc0db9e002fc SHA-256: 72d303fe7b903600e08d4d2b73daecf3d716461e75c15ca67b0993fbaa96ada8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to PDF files hosted on compromised WordPress sites. This suggests the document's primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4ae2611c---pizurezudaxofa.pdf In PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/rg4n8favj77081taogsfi7p2se/80360231816.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/zakopenovor.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/88829072510.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/nuxufazegixav.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803f5cc8e50---70524833753.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/hin8uj03lspusjajt0hnoclomr/87121425177.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/22c0f27fcfbd861ab060ca5cb9170071/79515033847.pdfIn PDF document text
    • https://tonitomov.com/picture/file/29792878106.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ede1ab0f3f---84437908515.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/d7sfh8llhioa25i2m9cqofefa6/27118731973.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/765e290f39b4f8a9d9ab3db3414be7a3/17274216533.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/32563094855.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d5c79cf579c6c29710c2d1fcbf75cb46/69131425264.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b26a50feb7---67117702377.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a49c5cc070c---34200844611.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078c1b0ec2ec---kijojewitilinimufefarije.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/k8ais6ufj6uik8073i51tcdbl0/68949857260.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5412ec45a7---73406751763.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/d47ae8df8cecc639ffc223b1b84b112a/siruwibuvegerefasufake.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/90427741377.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/50087622005.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/45674996336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=words+in+parenthesesPDF 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_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 10436 bytes
SHA-256: b0d31e5606f3eee99492030f736ebfb3a1ebad44b84595c4ec284a15feec11d1
font_01_sfnt_off0000ee4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 17828 bytes
SHA-256: 5a3a69dee1d5d1809388a0823fb76fb080c37489afae82723febbb81d0d82338
font_02_sfnt_off00011d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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