Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe3c93c8c0dffcc…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 11:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91a66d1ae1b4e04c39a3551b40881bb1 SHA-1: 4e0156a77a2b04fd720dc961432dd1ad81d6647d SHA-256: efe3c93c8c0dffccea11b58bc1dd6f82b0e9be88b30fc2031072c980d122d9a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS upload directories or disposable hosting. These elements strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing. The embedded JavaScript is a common technique for initiating malicious actions within a PDF document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=arihant+bank+po+english+book+pdf PDF link annotation
    • http://weifong.tw/fckimages/file/71667018272.pdfIn PDF document text
    • http://manu-transport.com/documents/file/jevasawusefo.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdbe41e8a6---9053248417.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/kakewomugeruguvovolapov.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1a39fa2b40224d3d0a0f3f7c8ba2801e/zogeboxap.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f722dfd74ad4tk58r7patkhrg6/kapuguz.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/51949642336.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/51b31869cafeb6b9be6a3e0c28a48ee1/buvegajawoseziw.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/kuxelijozi.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/gapemibusobu.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/25280021051.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/mewotawoporagizu.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/biwowobu.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/soletomutomozozawenuw.pdfIn PDF document text
    • http://mobilenmr.com/files/files/libujegabijadujadama.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/0ab2bf1c93bcb212d1a12db2d7d285c4/zegafibetuvobonoposozadif.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/78260574548.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/82880333844.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d144f252e2---tozuvewotadid.pdfIn PDF document text
    • http://naucseto.cz/storage/31330436699.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/koxitotorulizux.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c98603de5---18029254369.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/70lvf13nb0571v775rqbifkuk7/wabexasimo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79681a1a17---jubalogoxi.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/8897c6902ab9fc7a3bc4382eee9fd93d/duvawakanijopaw.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611039dce265a---480582228.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/56845505310.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_off0000c0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 17132 bytes
SHA-256: ce23bc5021d8f87b63b8f3f5fe84efbaf4aa79f8a227cbac14cd0424bad58f28
font_02_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 10988 bytes
SHA-256: 8c8ae65a24cc73d23eccb1bec62607aace4936095eebe2facd1cba0c17a82481

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