Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2cf735d5b85286b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 12:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab2b89ed0c1f38571711a44c74718ebf SHA-1: 0242872a234349e456bb5224e8391528a9945294 SHA-256: c2cf735d5b85286b2e3bae020ae55fad260d065a73be8924754bed7800bb9ac6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://shahnawazonline.com/uploads/files/nunawunilifurumab.pdf In PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/99a6b59f5715604ec88f1391b9efc5bf/62931662840.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/b7qcmfo0np1r3a8hft5nso9mj4/dijazalogetom.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/golovebipa.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/xorebujekexazokamuwig.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/79920998538.pdfIn PDF document text
    • https://partnermind.cz/images/files/namumir.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/jobuxuripebuguzinu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3de622251d8fbf360bca3c40efbfd8df/27752546751.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/4e6368dca97780dab9d0338a9f3a797b/94614197274.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/8elq5o7mvgp67srhsoockcubq5/rutojawerarax.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///68891109447.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/gasepiget.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/zuvuropiluxuluwajasuf.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e075d88c0e---depojisumefusifojuminake.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e640cdd27---79340888946.pdfIn PDF document text
    • http://agrion.org/upload/fichier/14060745635.pdfIn PDF document text
    • https://actor-conseil.com/files/file/47175089360.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/fovituxafavonet.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021080213030473499.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/49cab352adc8d05b24fc12c171cb4f65/447446370.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55dbdbdc3---43624159398.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e2dec55a3---94867947778.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/460788b151155229bab8e0595f96fa55/lezupekezabanurijemisisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=building+construction+materials+lecture+notes+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_off0000de83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 15740 bytes
SHA-256: 0acd75980ae8bed30fa58d6ab62cf41c7db12801419974b705ac61b6b6244c7b
font_01_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE4 11116 bytes
SHA-256: 723f1752d3e3e589b2a53c76ac6b7ce148e312ae21f2ee2dde0a063da413ccf8