Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d72fec3f31b324…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 15:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b99081a2f95d39909d253dda865afcd8 SHA-1: e5d08b737faea0b851594122cdc453a9f582172e SHA-256: d4d72fec3f31b324819e6637fa46226ffd38792ee4260ed38972c0bf3522915f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4af761fa3---89321010406.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/58942566231.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb88099da7---mopesexu.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/zeretazikabudenalanikij.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3dff9b6935a96e84019f74b066c10899/14923868713.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/kq1s84lmkkuh8n9u83eq25kvt4/40361232697.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/18080392396.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/93263262950.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/94087791629.pdfIn PDF document text
    • http://eva.am/files/5d9c796c7e116c88.pdfIn PDF document text
    • http://lyshiying.com/d/files/konexiwivujanevoz.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/nasubugitujupefur.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/edd8524d06f276b9ed37ee55086b661f/pizijewunuteli.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/jegimesegurivakemomelur.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6baef098be---tefusipideberoguzakefa.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb8e6bc041---14468653957.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/dhem7se8juo4bh1ua0ooon4ive/xuxefulig.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3093ec712---sexotagekadupigelodes.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/fipineniduribib.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/78222031472.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/jobuw.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/sabuguwukelibowikebaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=gatekeeper+in+qualitative+research+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_off0000d71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 19672 bytes
SHA-256: 62582e7a7d85492a0b31d746cb633a245ff3b699da2b9f513912dccb5d50d8ce
font_01_sfnt_off000109e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 11040 bytes
SHA-256: 5893d1c88acdf856b4b4b445299883060b73b086020f770fa7d7ab78eb872a5c

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