Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c73c2ecb77e2d7…

MALICIOUS

PDF

74.3 KB Created: 2021-09-30 16:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 71f78ee40ba3770163d3e61c7206d5d7 SHA-1: 5099abd3d7c7a52ffbf7b103d0880a2017de8b2b SHA-256: 30c73c2ecb77e2d71e3c95eaed07f1bfbcd87d8428af21c14e210ca6b4ddcedd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://archism.ru/uplcv?utm_term=telugu+novels+read+online PDF link annotation
    • http://pxmonastery.org/CKEdit/upload/files/rusazakovuronem.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/rofot.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/22630692847.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/bifudubinuvuxedefenibo.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/4378585305.pdfIn PDF document text
    • http://bscartridge.com/pic/93943367962.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8315fd777b23743ab5cc9f5540e007da/vobuxoviguxuvobakusuwuxiw.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/18644371930.pdfIn PDF document text
    • http://hueide.com/upload/files/8120495572.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a945fafbcaa08000aca71cd81a3d7cb9/nikilugas.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/kuzeruzogaxekopulake.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/ropete.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/segavadiwiximupewubabefug.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/50415343041.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/24124510176.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/buvifaj.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/89270087016.pdfIn PDF document text
    • http://mfahk.com/upload/files/fidopajowibis.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a85cb199---48489708736.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/leserawupogiledufenawo.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/05/nekesuboxufugewemaranunur.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/78459741532.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9c6127b8a112c32d9905fc281b9233b8/53205480451.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/26798940034.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/felenozejebejamar.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/bijililumurisupigojevewir.pdfIn PDF document text
    • 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_off0000b9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F9 19368 bytes
SHA-256: 44d720fec9c714371cc1b8c59839136f58579f236d2618573dd1bdb82003ac64
font_02_sfnt_off000103fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 10452 bytes
SHA-256: aa8c93545095289d196bfb7a7c5d8ae0261fa73bd9a83d4fdde4efae0fb1cdaa

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