Malicious PDF — malware analysis report

Static analysis result for SHA-256 357aa2f607b58310…

MALICIOUS

PDF

127.8 KB Created: 2021-07-03 10:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e8429036c68100b18f7bbf3b379d4c0 SHA-1: 912c29eac7972e5e4434e7dd3252e47ba6f6fa53 SHA-256: 357aa2f607b5831034dc3765f6d0ef3545a1428c21f516f64ea270472a649553
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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 http://laclonghotel.vn/upload/files/nizedinoju.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c403d0b4e2f---97594421293.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/4mdgvg9ruq8nvdp66fc6khaka0/92819619765.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1a443bef4---jadaxibupozuguvupuzowixe.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/02668782777ca03819e92afbe019f4d3/tupolozogosogelov.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/25ak8ngakilk8nfgvo84hd5ms7/jaduf.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f51ccdfa4---52282763557.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc668b11c2---21130569622.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0efba738f7fdaf8c0044b92144366f72/sagakuxe.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bba01d48489---73014717900.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/01c19c89a40dcf65304ed56815ea0fb8/27795249415.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609019f74d0c8---81222225141.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c87d8bbd45---30678584197.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/86b6ec15e8e469d9196b340567df037a/vulokugusef.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abecf0872a---56338523028.pdf
    • http://linpus.com/app/webroot/userfiles/files/70081112304.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/43885575748.pdf
    • https://aonetreks.com/uploads/file/88073454520.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a981ee9f1cf---fopadiniti.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079425ea89da---nipuriganiliri.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae26690acca---65966126942.pdf
    • http://botosani.ro/img/uploads/file/japafezalixibedidux.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+play+othello
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000195cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x195CF 16792 bytes
font_01_sfnt_off0001ade1.bin
6d622ef69092907c08c92d1dd3d13971a6dfeaa472e0b4fd7ff691c1edea5ca9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADE1 17496 bytes
font_02_sfnt_off0001dbce.bin
986e57855256ba7167438e637d9eb7d87f7b9b501bd6af0384653171b710ab6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBCE 10076 bytes