Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef791ce83b09b047…

MALICIOUS

PDF

82.6 KB Created: 2021-08-31 10:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: bead0591ce710336d16d597f8b551958 SHA-1: b63dc75a96993937ced693e83ff929178e6e0520 SHA-256: ef791ce83b09b047fb26ab369fb14277141b3c65913d24975fb4366560b971ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities. It also features numerous URLs pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=traditional+clothes+of+bihar PDF link annotation
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/vewesukoxewiwoposaxoginev.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083d14d8c8be---89247719928.pdfIn PDF document text
    • http://dentherapia.hu/files/file/ludozesugipa.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/rijelogosasotenosa.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92570b0f03---87840623237.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/48427877773.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a85a8af06---kikagebokakanalixivanapo.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/1515138960.pdfIn PDF document text
    • https://iaetindia.com/ckfinder/userfiles/files/4616315809.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/gavizotawopugisoj.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/jekufizunad.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///17816402932.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6669c9174---poloziwiveberekaweguzupe.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/dutoxi.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/122f7807072888fa13522c574c90891d/gufasajevazawolekadedep.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/59162383134.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b054db00c---42870887644.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/77d920ad112c16d5bc6e7aed47f8f813/70632709625.pdfIn PDF document text
    • http://amandamaitland.com/images/file/kamapegelo.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/47205960887.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/11777477581.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/2cec831984fce669503d175b7ffc278e/85053928599.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/37451049434.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_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 16624 bytes
SHA-256: ee6efb8312fc7be237f32aac29beeea389bbc02a09df62ce41c5d2e5ea7a1986
font_02_sfnt_off000123c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C6 10676 bytes
SHA-256: 032ab2fb01b571c3c5d2b755f408acaa0cdf9088a6a14240bfb983eb225c86df