Malicious PDF — malware analysis report

Static analysis result for SHA-256 b183ee96a19e8dee…

MALICIOUS

PDF

85.2 KB Created: 2021-09-10 01:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10fe812fd2ab70ce1f0aafb4ad7daaa7 SHA-1: dd7acdf167a9c67d117fd32e477a18cb0b12fb9a SHA-256: b183ee96a19e8deeb7109ae0440625ab9d26682a62279e9612809c7ac7911323
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://baocaosudanang24h.com/uploads/image/files/76466428724.pdf In PDF document text
    • https://beldapin.com/calisma2/files/uploads/58941243343.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/2hjggcgfi30ej69co964tu214k/dijegonilibuko.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/69384077564.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/zewofuvavexiz.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/mofusofusibugetu.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/99304481577.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/56385826107.pdfIn PDF document text
    • https://mangallagn.com/images/file/22340070393.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/rezalozirezoza.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/pukipazibisofax.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/luwosekinexi.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f287e37963---foxubomikex.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613985ead91ef---pirupa.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c728a2a0---misuxenibag.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/fifokezakudemowupon.pdfIn PDF document text
    • https://finliz.lt/i/File/17745431749.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/35035104497.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210901_111748.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/28214110191.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/68475209195.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/sikime.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/o9t7c9pjv5mpcj0blk39alui6c/60937007607.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/piwebanugexolebis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=best+online+games+android+2020PDF 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_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 18248 bytes
SHA-256: 888bd5199a1c8fc7fc5b4ddc947fb6f1acfaedcd36f607af8840f48dc0de2328
font_01_sfnt_off00011642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 10884 bytes
SHA-256: e7566cf3f1f8bb8748852807ef5a08459aee8790fb28080eca2b06a44bb9e0db
font_02_sfnt_off00012f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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