Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8aa24ad4d46848…

MALICIOUS

PDF

76.9 KB Created: 2021-09-11 19:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6cd27c3bcdb52021bc1ba758826cf9a6 SHA-1: f4c0326a68792cc3140921b623b517751cfa6b38 SHA-256: fd8aa24ad4d46848385aa0c10512bde07ffb98072059c3d5299715d96dddbfc2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sudaff.com/pics/file/powomesamefezepisibo.pdf In PDF document text
    • http://gfk-schwimmbad.de/i/File/febakasezinovikek.pdfIn PDF document text
    • https://medpressa.ru/files/file/gataxaletoxu.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/renilapus.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/dexigo.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/robarijitutuzivuxifen.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05d990f93---mabijixogibesomivazaxuw.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0f687d26cdbc2e6a33331d10e382a575/febuxakorulozoteta.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/78576726939.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/51713621794.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134befe954b3---14724704990.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/10838206706.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/wogovemususate.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/sukixunu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613259b37b19f---81518972270.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/fekulu.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/43579338769.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1479008577613341ac4f4e2.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/888027789.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/gomet.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/86643116119.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/15092622141.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/pagiwimerabin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=speakout+upper+intermediate+student%27s+book+pdfPDF 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_off0000c706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC706 17296 bytes
SHA-256: 59bdef201955d6627794a42e23ebe1da78b3be50a26dcd5caec2b3e1f98374e7
font_01_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 11052 bytes
SHA-256: b781d4bba21e7b07d0674fc0ca9956897a602ee1ba2a3a1085b2ace4bd7b3914

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