Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf999d0401ffe78d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 06:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 808fd4292cd541e6160c05c5f58e89a6 SHA-1: a8dad4e715602de0dffb31fc8a372fccbc8bd8e7 SHA-256: cf999d0401ffe78dec0701c36358695902c2570654d200aaf73d87cd43df3a70
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains. The presence of invoice-related language suggests a social engineering lure to encourage users to click these links, which likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=pdf+to+html+web+api PDF link annotation
    • http://exito-opakowania.pl/userfiles/file/6479397234.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b273e5af674---41603665405.pdfIn PDF document text
    • https://amblamy.ee/upload/file/57332403600.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/telafelebow.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/fd3efac310b1b0dafad36e66d337bc09/winijutinexunejojevu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/8pgearo7ek7ops95p7uuvhkr56/wavumulozupakowamatif.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/11664088300.pdfIn PDF document text
    • http://moodyhighclassof70reunion.com/clients/2/24/24f6aee67edc386a60746049a176a33b/File/56819105153.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/8a56327187f00e7882a06546473a11c0/buweb.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/55648392187.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/95046525787.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/fizoziviririretujexewot.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202108170302187734.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/muwodunerisoratoridi.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/71462362588.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3b71d8e3172c0b5464424a1129872062/53157468821.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/36899903045.pdfIn PDF document text
    • http://kasargod.net/uploads/file/92608395869.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/jebovefirufumu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c365daa30---kefebaruzar.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/07/files/210719142727.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7b17e25b77ddbc879aa1efe84ed95d23/68842459656.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/84223884551.pdfIn PDF document text
    • https://grandegroup.net/files/90374742153.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_off0000eaa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA2 10620 bytes
SHA-256: ba40918c9785f18005158f913be9ef481534ad76279c0aea91c4acf020693123
font_01_sfnt_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC8 17748 bytes
SHA-256: 97fea3700e91139f20407751eca038949e8070c42e12ea03e98804310ad56092

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