Malicious PDF — malware analysis report

Static analysis result for SHA-256 faaef80c21aca4f1…

MALICIOUS

PDF

70.1 KB Created: 2021-09-21 05:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 960f56ff849a9b3108ca5ae7e619ced5 SHA-1: c00cef81f1a16008eeb3174ebd98fc08e016727a SHA-256: faaef80c21aca4f16d9f3b91ec953fbfa88ec86b87a9e7f9ad40e7ca87374fea
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://arte-salon.ru/upload_picture/fonunagesususerube.pdf In PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130286eeb58b---61718413705.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/rrutjf9d84jos1rrrlfp5bg395/84637563484.pdfIn PDF document text
    • https://stotex.rs/files/mobapelopadatepipamo.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-2/20210902215102257908.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/wagaluj.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909041308964186.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///49533864944.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/fb6a6811accbbaf9a5bad2364d1732b4/16220204754.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/sopigikulabimawuxiketekof.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/samito.pdfIn PDF document text
    • http://annabarons.com/files/files/2738599406.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363e09ea787---25266165482.pdfIn PDF document text
    • http://airmon.hu/images/files/rudejuvoz.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/91427323276.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/2052348555.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344c04ef398---26153415534.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/28870800858.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/97686094109.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/94784043637.pdfIn PDF document text
    • http://livestocktool.com/d/files/94958454697.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/47570306927.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/8556510005.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/disowikolijikija.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/99250833858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=car+parking+3d+mod+apk+downloadPDF 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_off0000b48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48A 10720 bytes
SHA-256: f7c86ca4f0d1c7394166b0b95ba872e7346224f36de696cb3f4cbb197126f588
font_01_sfnt_off0000cced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCED 14932 bytes
SHA-256: a0e75fddd66bea87ef72a6dcbf4e33faabe9ad74b0e31b67eb5dcf266a82b1c4
font_02_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1