Malicious PDF — malware analysis report

Static analysis result for SHA-256 6338652f039f13a8…

MALICIOUS

PDF

78.5 KB Created: 2021-09-11 22:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bbf7db07b881235f2bfc7880eb792312 SHA-1: 2b44ed209f1ccc8e7e8b1021dcd0d4d1766adfb2 SHA-256: 6338652f039f13a8f770e9f87ac1065890811234d901ca7ec0350463531dd01f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://ketchas.ru/uplcv?utm_term=cricket+career+apk PDF link annotation
    • http://feuerwehr-mittenwalde.de/mediathek/files/zijofanufapudunixibu.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/29251904640.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/89189732663.pdfIn PDF document text
    • http://www.520amis.com/upload/files/bovuwawefafavixivuna.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/3c098773bea82965a9be23f68fc02262/xigipom.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/miwufalofozofavudewomusa.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/96414828645.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/pexopogiseduzevusilumik.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/de96756e904608cfdcf2ba1a0760d3bb/zubulexega.pdfIn PDF document text
    • http://renknh.com/ckupload/files/25427503251.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/31609348238.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/jodibuzowitisizi.pdfIn PDF document text
    • http://njxinbell.com/upload/files/kujipirezotukagopidi.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/vunatamaxodufuraturo.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/napur.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/soxuvu.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/15309731404.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/be9f6e92f65c2b767b5844650c14cf11/rofagerinirugazajadotexo.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397986d16b8---27827490976.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/39724489239.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b329a4965---78080633253.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_off0000d1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BF 10052 bytes
SHA-256: 924538f1eb8c340b08bbebd82faebe77afe56acd56589be025199265303241d2
font_01_sfnt_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 17140 bytes
SHA-256: 669b2a1b6cad1b942baeff20f5573b72d4febb6d138ef6ef6136379eebbe586e
font_02_sfnt_off00011488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1