Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d77546a7ad13b4c…

MALICIOUS

PDF

67.8 KB Created: 2021-09-12 03:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3a3d205ffd636e4c8e96ef29303fc154 SHA-1: 7322f824bde17ac371cbc5c696840d67f13f2492 SHA-256: 9d77546a7ad13b4c04db76b9fd5ebd35f799e64597715ffa4b5ecb7639ea21e3
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links, including one disguised as a 'flash downloader for android' on a compromised WordPress site. The presence of embedded JavaScript and the nature of the links suggest an attempt to trick the user into downloading a malicious payload. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://alacarte-grafik.de/userfiles/file/65067641077.pdf In PDF document text
    • http://librojuridico.com/aym_images/files/sujomibox.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/wewivozibeje.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8343ce172---lovovivusut.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/diwifefikevetasalotixega.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131c51f12a2a---rutasabamosulinukiz.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/67346486420.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/siwemulagedofevo.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/loxovivudito.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/mifurijinapomulunixoturo.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/pawedelusogimejekuxigaza.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/37659498380.pdfIn PDF document text
    • https://faceless.me/userfiles/files/xojupodelukiwuro.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/rizomaridepazeton.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f1a00638---79637717015.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/81905144902.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/14505315873.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/16297342574.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h3adli12m28krr3ehj0uifal3q/31482305543.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/95983151394.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132af9b04d84---nizabe.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/nekolefodob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=flash+downloader+for+androidPDF 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_off0000aeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEB 14312 bytes
SHA-256: af0edd07c0696fb58894c98ad3ebbbac734250b1f1fdac179c1cb8b21a312961
font_01_sfnt_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 10416 bytes
SHA-256: 03b239a409888f7d7a6f15acf7b89b9c7bf3539a5cabfe5822d782cf3a2cd249
font_02_sfnt_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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