Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b78cf6801a7f015…

MALICIOUS

PDF

85.8 KB Created: 2021-09-06 20:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cbd787540fe8670e0c103dff83e76b8c SHA-1: 35b64d9ed50a661abb61a65fc56b7fe89abcf5e1 SHA-256: 4b78cf6801a7f015f910989b565986e2686345ea6a23ef11e2e93d9498780b9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://phayaotechno.com/UserFiles/File/pebejezobojafagipev.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ec2f364afefc8cce85d46a83e0c1e2bf/rubaxozapikaka.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/27569835956.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/tiwixedato.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b458942c2---72760949058.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/benala.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/ponumaz.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6lsh82tso44jl8g0epaf20qcn3/gaxaxovi.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/xuvamesoxazifuguzikorofeb.pdfIn PDF document text
    • http://msiutilities.biz/documents/fetufewegibuluvojuf.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878575503f4---gugefof.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/wonotedarepozakomakajun.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/87202036556.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0988c57b7---45395255321.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/42025669380.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/987e90b25019d6c23f56ace93632558f/77014726243.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/26947878362.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/66793930299.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/68120792165.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1629200699.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/xivixurabo.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d904dc15d---79900102898.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607616f946037---82145508511.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4ad298d55d5e3f4640ec842c388d6a40/lutavisisomipifojalik.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/xetilonubasufuponunupato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+acrobat+pro+download+freePDF 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_off0000e364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 20492 bytes
SHA-256: d6c393e8af205581754fb06f237f109c50ccdd104e43b44e2f41d91232e85c49
font_01_sfnt_off00011979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 10580 bytes
SHA-256: 7ed4a7d4e389c0e9b27592733a17d0328c6a55af27e7bcdb7ee412b258d4fcb7
font_02_sfnt_off000131a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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