Malicious PDF — malware analysis report

Static analysis result for SHA-256 f985e8b9661e3cf7…

MALICIOUS

PDF

79.9 KB Created: 2021-10-12 07:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2994b48c4cb86c8abc98d31091dddec6 SHA-1: 6d729a9da403741936b096cc2ef595327909b265 SHA-256: f985e8b9661e3cf7c32135484d183fc1f8079aa41e2c83ad9f4d2f731410fbe9
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous embedded URLs, many pointing to PDF files on various websites, strongly suggests an attempt to redirect users to malicious content.

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 http://veterinariacasettamattei.it/userfiles/files/18563842855.pdf In PDF document text
    • http://skinct.com/upload_file/file/Fl202109080256198971.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ded935de08---velunelugabaderana.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16149a7b4d8290---tukoxagavikelufesazum.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/43863116912.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/pimomonasenazum.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/3076569239.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/4458109431.pdfIn PDF document text
    • https://people11people.com/uploads/File/13708183559.pdfIn PDF document text
    • http://danbikoreansj.com/uploads/files/vogifibaka.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/furowerafaludup.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/ribuvizaponopitasokum.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/88675223908.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/demoduwafomaluguwumeti.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/472231432612fe025381c2.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/bunanimerigudisovu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d3ddbb939---8270987256.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219131352184520.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/68087807943.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/l40s6b9s17e00nftkjs1sbd0pi33gdgf/xovilorujefilelemobidilo.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210925_ACC7B1D35558437F.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/lazabedaro.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/zozigabaxisumudafitix.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/vItLtdF7Pec/uplcv?utm_term=how+to+fly+in+creative+minecraftPDF 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_off0000d2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 10584 bytes
SHA-256: d94d9bc621cacd732cb996c04f765bd04d93c698c73f8c1c5a8502a722d07ce9
font_02_sfnt_off00010318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10318 18332 bytes
SHA-256: 90a4dc4359d70db4bf8f8099ccc0e7c814c6c8e6a606283aa508c26ea251d01e