Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc9b7973f9b8bf7…

MALICIOUS

PDF

81.2 KB Created: 2021-08-25 04:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c96bda7cbafac7553af1dfcbca7db30b SHA-1: fb6a7e1ae1f8f086892fe382574a41d4e2a1aae0 SHA-256: 1cc9b7973f9b8bf71011c790b6c62f1893a54a4a44e8400462c463af6db2f5f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these external links, which are designed to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://cructi.ru/uplcv?utm_term=modern+combat+3+android+apk PDF link annotation
    • http://frappsreagent.com/upload/files/minifemizipazerobik.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/16015087614.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/47161387657.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/87150156a35e2e0345215e2615bc4e3b/35984330637.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/5215212321.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/1f05cd41d5d8faaece43ce05b51e2244/jateberamix.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/magoborurazuwuva.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/41454485286.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/werebufotusewo.pdfIn PDF document text
    • http://furniture83.com/upload/files/zukuboxalimudama.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f00fabf161---27018723334.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/82364733878.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ea3cb544---70306758266.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e69fd9f3569---mamifasuvum.pdfIn PDF document text
    • http://klinok-saintp.ru/files/jisizajotoz.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081348d131f5---puxoxivosidezexen.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/66332872721.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/58415711469.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/8144602547.pdfIn PDF document text
    • https://ivanamihic.com//files/rirajudemanajofat.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/dorif.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/bovamixugamenuvivad.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/pqrkaoqcm9dnib14cmrstab4rs/20943664811.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/gelusamosod.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_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 16904 bytes
SHA-256: b4de6f87893719f5e93d6c490323bf171053897895a88ad2150e8712939d9474
font_01_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 10856 bytes
SHA-256: 5a5352e3e8e31228f61e2e612aec2ad53ca50a893eab0bba986c8e2a8164b217
font_02_sfnt_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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