Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e183910b0fe858d…

MALICIOUS

PDF

74.4 KB Created: 2021-09-08 12:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8fd48cae073be82e4dbb323d6c90955a SHA-1: 3a30ea3c8747ea2a2d2fa69cff0afd34cf234857 SHA-256: 6e183910b0fe858dd79b18c1cc648d686f3876d373f48d37a12bdbfce97e930b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://gemcom.org/userfiles/file/damaxi.pdf In PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/1031029864.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/zobidusexerasarofenutotu.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/36134951239.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/15778072964.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/92854783548.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/vefubugudaliwuz.pdfIn PDF document text
    • http://methese.com/upload/files/29084493101.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/59583014320.pdfIn PDF document text
    • http://air-ned.com/uploads/files/53942334306.pdfIn PDF document text
    • http://baove247.org/upload/files/74298493083.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/46949508318.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/33830797382.pdfIn PDF document text
    • http://cascad-trans.ru/files/sefijavemisifi.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lasonawa.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109041213441447.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132a5c8e77b5---21105988653.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/zafisipa.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/23062204299.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/lulijuvib.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6f21b35d---tatudujas.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/37151763588.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f40771601---95613841310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=parasitology+paniker+pdf+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_off0000bced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCED 17844 bytes
SHA-256: d84e722691bc978a59f3ebd420b6cd72dec17c9c2daed2f027b7efe2dcb2da28
font_01_sfnt_off0000ea74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 10964 bytes
SHA-256: 4d9a8ee0bad5af9aa6e4a0006a05e34cf57b8207a8a39e044b966aeb8d6c5f31