Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4e9924170528b8…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 22:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 6d0bd7fa14425042c13de13c1e06039a SHA-1: a219d7372ff13f6e14b2893f528b79f29b119b92 SHA-256: 1c4e9924170528b855e48fa596a3525f0253dbacf6bd8a6ac3616395e5b36d3b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=ambiano+pressure+cooker+user+manual PDF link annotation
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16087875319d9b---favomesun.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/l60qksbt706u72pquebii045a7/99369648688.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/wegofanasibewefifexowubip.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8628198670.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f5b4f9e0e1255d0b5bee6fa68129314e/34626569453.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/72602189846.pdfIn PDF document text
    • http://realloans.com/clients/73966/File/379904612.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ce288b2b6ae9ba1e4128592742e1437d/10693196887.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d42cd64e3---wegovewopixanikilibi.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/87925075818.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/literavetizipolasav.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/29846015352.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/lamavejalaxomowapap.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a499550dcc4---63167257256.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/20624482748.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2783205541---5669177697.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608f24661f95f---gepibubawilekinalosigeke.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161108485dc840---50289155682.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/18148747793.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079514dbfdc4---48519128053.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/nezoxebefesudegulinonu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1083c014e2---68901851407.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/navejebevotafo.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/15470058188.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/vafevuwarufibisogafaxeko.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_off0000cf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 10748 bytes
SHA-256: 2e70fbf286599066bc0b15beb2589a2521d13d3a9df2772dc0b02c5fd3f02836
font_01_sfnt_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 17496 bytes
SHA-256: 7fa546cc78a42ef34138494457cb3eb25a0c602541db5008b9b2e6201bcabd9a
font_02_sfnt_off00011543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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