Malicious PDF — malware analysis report

Static analysis result for SHA-256 812b118c1a348a28…

MALICIOUS

PDF

73.7 KB Created: 2021-09-07 07:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4940e54c5c29e2cc2ef0d688ec8fc50f SHA-1: e6ffab1cb83bfc9df9e42995250e5efafbcc4310 SHA-256: 812b118c1a348a28e9e03f7462ba697f5fde7c8aa881a3bac0c0b39ad6db477d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=chogyal+namkhai+norbu+pdf PDF link annotation
    • http://lnianemarzenie.pl/userfiles/file/rigevewokom.pdfIn PDF document text
    • http://atomleasing.ru/media/File/35033009823.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/7233587846.pdfIn PDF document text
    • http://partnercable.hu/files/lenenijonowexifepobijo.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/sakor.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/janisunidofude.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/91c7d3ae95b8a8a5231eddbe72d65fd0/tuxujanivafowedeza.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/11761022378.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/niseginibomak.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/u0jr8d304mtb9bb521mos3329f/zorukalodeno.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/76e14d634b13e77762934c7f3843731b/kijipamizibefenizafol.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/pisimasuginudujisu.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/30858730617.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/tapilezidagesegiluna.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/gejabesen.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/xipapejiruxugalusoleb.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ar88n2s1fupiqon69qcq422r6t/tokivevosepog.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/1514426916.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/2b57bcb5490e0e712a897bb45b957933/basexabiligazojenabomu.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/74016305762.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/96066598825.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825457b8b80---94825444146.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/xiniwakepavamavesawajifiz.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/rajifunanosi.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_off0000bc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8D 17128 bytes
SHA-256: 75d3a1b3827082f08850a6982fab13fff6e2bac845266480917309e69b10d6e4
font_01_sfnt_off0000e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 11024 bytes
SHA-256: c9f68f534302117b57b23be45a9e9d8b4172c3b2894daacd49c164ea4f58779e
font_02_sfnt_off0001015c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1