Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77640c0857f7de2…

MALICIOUS

PDF

95.0 KB Created: 2021-08-29 02:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4dd7be23f24d2a47d00ab00fb86eb442 SHA-1: fb89f2f357b77d49486386719dce9df15d1192d7 SHA-256: c77640c0857f7de2ec79288fff29b9f6fc8daf808f2bd6833b842320e18c9019
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also links to multiple compromised websites, suggesting it is part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/745c065b2accd7c3c016255703bfc6b4/59019545751.pdf In PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803a7582930---4800790265.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33e3302ecd---kalilitiwabej.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/3faa634a7f78baaa41f84760372b7db1/degatipoj.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/dinuvofebepogilada.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tnou74mimg90ot1rlf1hd3f932/13023460567.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/62f9854a35f3ca1c6f0a2b6926da69de/33851935762.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/0d6ef8a50d3f85fefcc0ef71fdbb223a/63497469596.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/bidojazes.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/65222424869.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/34501708585.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/be9eb49be4a41b46f849db721a49d078/verogitexuzogekofome.pdfIn PDF document text
    • https://kopari.hu/files/file/35097835856.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/7270588008.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/tutemekitukuwapagusomu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d54606be4---40520973115.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/64997839073.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/kibamitibiwugokoferajop.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/panijamusikagewunukupamu.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/sojekewexafezad.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/kivep.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608845022f761---subuligular.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/8cgaptdeakru8158fsgktr2ko0/voxigurowiwolitigin.pdfIn PDF document text
    • http://irths.com/upload_files/files/24376613356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=is+salmon+bad+for+youPDF 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_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 18900 bytes
SHA-256: 004b427bacb47f50088c5bcfe4f872ee0b5fd553c81302a327fad4fadd641539
font_01_sfnt_off00013e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6F 10496 bytes
SHA-256: 1e47dcaeec20cd7b73bc067e40130a8adcede3bb211cd3b8d64532e9b341c44e
font_02_sfnt_off00015643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1