Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ded59746e3ebed…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 15:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b5508acc412f83fa52a59be97ee9ead SHA-1: 35a9954c06b5819109309a526158009eed2ea915 SHA-256: b4ded59746e3ebeddf190c2680cd8137a3a445eb1177eb995a9847505e0978c4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting it's designed to redirect users to potentially harmful content. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/82b0bd721abc15f075f36bff17191e49/19009866194.pdf In PDF document text
    • http://insureavisitor.com/userfiles/file/pisekopogarekoxegejurewaw.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/mavanuxisofiludit.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8888ea2bec41f8a7e4c2e843c05d27ce/91000728707.pdfIn PDF document text
    • http://fxlcd.com/upload/file/73108772271.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613810689806c---13282689083.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/16264841386.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/dafurozoruzapave.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/tebinafapoz.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/65593229751.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/55825236502.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/63183880253.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/jurilabe.pdfIn PDF document text
    • https://digireg.cz/upload/88437626110.pdfIn PDF document text
    • http://goodnest.info/tctt/sites/aaa/file/losixub.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/64601825414.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210903_225318.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/joxabazev.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/pasosuzopovenilejol.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/zipoko.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/zizefolunosisajik.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/sexumaxo.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/28388423899.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/jesigapamosogos.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/65253456441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hack+via+id+free+firePDF 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_off0000d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 10084 bytes
SHA-256: 45af424eefeb6f2cde395a8a66d900be856fb88696b32ac0a983e050543efdaa
font_02_sfnt_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 18988 bytes
SHA-256: 495cbd0f15500f42f0860aeb85ac30f6fe58e022950c8f4fd09f8ee017ed657f

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