Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dc93134586ee8e…

MALICIOUS

PDF

72.0 KB Created: 2021-10-03 10:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 08ed865187d9a2dfd37a7c46eff00e9b SHA-1: e54287c7330da2c5f5728f9c731f3ca41b27c966 SHA-256: a5dc93134586ee8ee4cb7fbc5960528fae3de7724166ab82948516d8a91014c3
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 within documents. It also features numerous external links, including one pointing to a compromised WordPress upload, and another on disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • 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://irlanc.ru/uplcv?utm_term=all+black+doberman+puppies+for+sale PDF link annotation
    • http://adbuilder.at/ckfinder/userfiles/files/15783121044.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/14025592777.pdfIn PDF document text
    • http://medicareclinichowrah.net/faboriginelist-braj/userfiles/file/nakemajupak.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/pexozasame.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/97102980468.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/8272615765.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/barirexane.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/65093384314.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/fazotupan.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/tesizugap.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/taladejivaguxufinu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/771dbec1508c3fe804eef0ca85ed3c93/rurobowumod.pdfIn PDF document text
    • http://eurosolar.cz/res/file/68325772203.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/midigadiwovavulavib.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/99799318056.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/50211040568.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/vadumigikijurofadakageba.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/69246372405.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b017488082b6aa84e6bd4a1b9d74587c/57525364643.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/97718030787.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/1296666105.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/sajarumivafu.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/19634428511.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/fixexijodamiwujelez.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/bijiberepigomasavogib.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18063c41e---14401255789.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_off0000b3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C1 17536 bytes
SHA-256: 1c7dc260696fa1014adf3c517bf9c1987f87408067dfd4d28531457a7dd531ca
font_01_sfnt_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 10996 bytes
SHA-256: d91a0ec429b0079045a7a88a350d63db73ed557b42f113385675a1dd2215c52f
font_02_sfnt_off0000fa23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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