Malicious PDF — malware analysis report

Static analysis result for SHA-256 857c472008de15e4…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 11:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d909e5b4e2573ffda40655017f88f059 SHA-1: 447fb2d4337fc74011474326aa07d13c584ca49e SHA-256: 857c472008de15e4e6c491d8a584e4b7b04daafbeaef830783993756dd72805b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to distribute malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://usagimatur.com/files/others/14496644965.pdf In PDF document text
    • http://isleford.com/filespath/files/20210917050024.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/5020780919.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/fivejutezod.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/jidutenajulozajaw.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/zulujifa.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d26157ffa4---79577608436.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/kegenulesisofase.pdfIn PDF document text
    • https://senegal4d.com/contents/files/rukuginiletakoxapa.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/judimakaxera.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/setixanido.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109020555509364.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/49186130908.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/valamuwelapovuxino.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a660271b9---79522373290.pdfIn PDF document text
    • http://ssp.by/var/upload/54243116773.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210901102557.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/12200896488.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/85193495188.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16145839b59243---kukajifibipiga.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/27183435442.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/44506224581.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/847hgpmgn7mea8fhpvv730bp6u/silurojelemugisorin.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/50058946831.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/14268092178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=vita+video+editor+for+pc+free+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_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 18092 bytes
SHA-256: fbb297acfe35ebd8666b29c7b6850036812969bac938f7b043afed04ed9e9c7f
font_01_sfnt_off00010d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 10564 bytes
SHA-256: 01ed71e5c5ab500e99845e1604a6491ff797076e5e7760741ac44c59949bd40d
font_02_sfnt_off0001256c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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