Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a1cfc93cd20ff7…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 17:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 34cb8f159e40b28fe0c8ecedcf8960cb SHA-1: 9a8269bdef4423fdc0a6ac0126692df7cbb9505e SHA-256: 36a1cfc93cd20ff790b64361512a718c5d8f50d72f4c03a5e89c6aa4b0826a0c
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress sites. The PDF likely uses JavaScript to execute malicious code or redirect the user to a phishing site, exploiting a client execution vulnerability. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a campaign to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://kovofilm.cz/userfiles/file/603878199.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613596c4c5f1b---jasegupikirirazeludokuju.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/jatag.pdfIn PDF document text
    • http://kelsenator.com/userimages/6123493665.pdfIn PDF document text
    • https://bak.vn/upload/files/13992380923.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/59793589348.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/29234666615.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/42684571334.pdfIn PDF document text
    • http://tecksco.com/upload/files/89615120454.pdfIn PDF document text
    • https://grancom.by/upload/docs/5979142741.pdfIn PDF document text
    • https://beautydent.hu/editor_up/66812680974.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/67893482275.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/88395949806.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/92129638919.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/29923388625.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/salumasidakijuvu.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/24eca4d06d4114771a0e5f44bf948452/55432604862.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/boseninewuvopuxebotigafen.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/21372116499.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/35371689915.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/abhb4hmg751tfckjr0ptvi6qbp/45082783623.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/58976570115.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/wipoje.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/16kidsj8vmiuahud4cqkovg829/viwanuxubevanilufefoj.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/lixapewotesujafo.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/nenitotevodugorujobakoju.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/25235709888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bluestacks+save+data+locationPDF 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_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 18816 bytes
SHA-256: 8dade596c3b6f675feea5f6186fd7fa2c36eb866d5a5915b8e1b2c1647d4a380
font_01_sfnt_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 10576 bytes
SHA-256: ee3ef3044a96db1aab677981eb4c000870e7bcc59c92b98dddb87182c066a6e8
font_02_sfnt_off00012451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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