Malicious PDF — malware analysis report

Static analysis result for SHA-256 981fb6938205de79…

MALICIOUS

PDF

82.1 KB Created: 2021-10-13 04:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7cfdc18c901885ec207883139f541571 SHA-1: 310d3542adbea0f0fb357bd93d87eb122e5b744c SHA-256: 981fb6938205de79efe7b6cf09eadf3cf7998de583fac0074500d2a3e9712ce3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. These links are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=milady+esthetics+chapter+21+test+answers PDF link annotation
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614169aa12cfa---gidovepotegati.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/75345941035.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145b76493a5d---tulivavozazezabukorone.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/wozovaxatugeselilelebo.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/84734193150.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1632988057.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/63691739344.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/25578735420.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/zebovilulugevilefusenu.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/84551599498.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/77518676444.pdfIn PDF document text
    • http://zamaro.info/images/fcke_files/file/jutowureg.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/60850540942.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/xuzadusiputasuzaxunasebof.pdfIn PDF document text
    • https://fitvital.hu/userfiles/files/ranotun.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e80a6ca4c9575ffbebece81502683b92/libifevuri.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/78412205643.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/zotisanozazetinanazoret.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/wejokebolulodudadog.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/borizuwosifi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16155729f6ff80---63531019771.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/gidonumadod.pdfIn PDF document text
    • http://fialki.su/37151215296.pdfIn PDF document text
    • http://ezicms.antifftech.com/uploadfile/file///2021100102114320.pdfIn PDF document text
    • 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_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 10856 bytes
SHA-256: 6f91bc6c7d7ce9326ac070ad854958f14143b5df61d6c794c54570dffbf21910
font_01_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 18780 bytes
SHA-256: 93fa81355a2009e183e97181e9b41462659f11f96008aceb2507801eba524961
font_02_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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