Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd8baa354597208…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 14:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1a4bbebb6ecc1753f1dd3a17530af66 SHA-1: e21aa303110a57c29e4a866912cbb3716b82db5c SHA-256: 5dd8baa354597208145cc0277569eff03d7a94baf4c845f30d5004acfbc165b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, including links to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious sites. The presence of JavaScript points to potential exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=zootopia+full+movie+torrent PDF link annotation
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a7a336fdd---lomovexazuxonako.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/funomugoranubamibigig.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/87352862367.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/lupanuvisokipenu.pdfIn PDF document text
    • http://uchid.com/uploads/file/babulumebuzira.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/14934590620.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d3e028635082e79c4a0a1e0d08b66f31/88037884836.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210911131321.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/37488660382.pdfIn PDF document text
    • http://www.sczct.com/up_files/file/sareliwowirosiv.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/ronotatiwivizad.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/39622557117.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161441d10d1dc1---20352260709.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/kanujoxajapigezok.pdfIn PDF document text
    • http://katachizu.com/img/news/files/wepaxoniluvipotoxopivuvom.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///88820477065.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/57920863553.pdfIn PDF document text
    • http://berbun.com/user_img/file/68723475549.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/43517889035.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/liwenifijax.pdfIn PDF document text
    • https://akemi.ro/hirek/file/kerofiganisejubodilux.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/91427964621.pdfIn PDF document text
    • http://c-six.it/userfiles/files/47970735228.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/36003389198.pdfIn PDF document text
    • 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_off0000aea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA4 14980 bytes
SHA-256: 53cbac395990ffc9002ce16976d1e78222b5b63cd3347a93dad41d9ed56538dd
font_01_sfnt_off0000d450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD450 10480 bytes
SHA-256: c12ee6b38cef730a5a459c80aefe70a2f1215b0189e7679413780152211b9d5e
font_02_sfnt_off0000ec26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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