Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b617baab67e15b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-14 06:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8511c74572d4a09cd4f65c04e0b33542 SHA-1: 9f6190ae4bc67baf5439e56ef10f7c397272bee2 SHA-256: 71b617baab67e15bedf9f2a3970caa0c197fa7c838b99e7f3fcd0c7bf7f8dfbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://aven.su/userfiles/file/bogifilazoge.pdf In PDF document text
    • http://pijntherapie.be/uploads/files/donabusugawiwebuduvapa.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/nisaxusuwixojebufabakotow.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/43046339572.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090606034678478.pdfIn PDF document text
    • http://rotang.net/userfiles/file/54055645081.pdfIn PDF document text
    • https://bataretak.com/img/files/file/13523519199.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/bowulizixavuxisepokig.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/27164714104.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/tatolofebesagajefekavu.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/50353688711.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/wujogagejenenabex.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/9988886646.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210911_023042_8637.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/v8ldkr6v05mm3phv7bk90is5o7/mujidojowu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2c9ea14116e208def6364eca4f5d3ca1/76268187462.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/80583028942.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140024e999d5---zevazisevojilefetu.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/39277018248.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/10062273325.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387c34d93b1---duwakujazozokelulaxapimet.pdfIn PDF document text
    • http://sieuthibds.net/images/files/xanubivafujof.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/fupegupujoderusidipejes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=live+tv+channel+software+download+for+pcPDF 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_off0000cfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB5 17828 bytes
SHA-256: 364d789eb71100eb82505ccde87a191c9232eb57199bb858edc890781103232f
font_01_sfnt_off0000fdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFA 10824 bytes
SHA-256: 6d5f6f95317f67cf3a2dd3fb1ba760d3195007f9b28cd2e4ade41fa4b498e6fe
font_02_sfnt_off000116f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1