Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e82a0cacbe20ef…

MALICIOUS

PDF

72.2 KB Created: 2021-07-17 01:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfbe1b1d0a3c7254f8ccd34561b41598 SHA-1: 55bcef4740d2d80ddd4be0ce1133a81188d77a27 SHA-256: 16e82a0cacbe20efafe06bdde95f680c5d0b661a31e489e761b56e7f55712c96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and other domains, suggesting it's used to distribute phishing content or malware. The presence of embedded URLs and the nature of the link farm point towards a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/cafec38eed1a7fa753a9c84a1754b467/10593437062.pdf In PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3a19dc712e2b2355c47821844ef914d/11131026860.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/jitos.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/pabazojeriwidezetufiwo.pdfIn PDF document text
    • http://sdds.be/userfiles/file/79698200385.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/zakirasimoralazubafeli.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/dogetafowunu.pdfIn PDF document text
    • http://computerdoki.hu/user/file/52140804312.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cdfd7a900aa---gelasesinimasefufu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb946bee4d7---befogolevapowonedudezoze.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/45854342876.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc33e4fba3---33835983450.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e74518a71---waroroki.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/lawarozikekonugu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9be3be66f---retisov.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/11d8f944c3cd5f790bf063ebb446119f/sifopam.pdfIn PDF document text
    • http://candientuvibra.com/images/file/tazotuledokodadagozikaxum.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/39042950303.pdfIn PDF document text
    • http://jarosi.hu/files/file/61334477273.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/dmfp7bgg1hjue5clhncrol8gb6/89413446348.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/togujem.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8973ea8621---gofemukijefovurunabewo.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2228a56e9---fokosajenowezi.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/36589668706.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80663b3c4---50752440888.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/juwuwap.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/29667723086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=theory+and+practice+of+swirl+atomizersPDF 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_off0000bbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCD 11108 bytes
SHA-256: 7821cb9b981706766e1c30a8ed9b358ea81f2f1b6d92ad1d407cb1f4dede90bc
font_01_sfnt_off0000d59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59F 14844 bytes
SHA-256: 5b4ab3126f38b7b5bf36dc361394a69d8c39f79eaf9ad7701620383b6d66cb88
font_02_sfnt_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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