Malicious PDF — malware analysis report

Static analysis result for SHA-256 725674c607210da8…

MALICIOUS

PDF

116.0 KB Created: 2021-07-08 23:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b54c802a2c976d03346ed8058d75b4b3 SHA-1: 635bb4bc6a519176738eb2c42f096a22c5ff7a45 SHA-256: 725674c607210da82cd6881664c39390daac3103a7821ffbc6a8a2ba75d378a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JS suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://haps.company/wp-content/plugins/super-forms/uploads/php/files/io5kbbj62a6remu7c3uuja1j07/wodivatigepi.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/amq5obfrbh7mmhf5kpii2kimp3/72619016790.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f093c710fa2e80f412695b85b1daf371/losejebelixabasijodivig.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21d5687854---710450505.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b30f3f8b4---larodazoxu.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/nodavujoj.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/56961277805.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/javemasulete.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0e37f00d1---vimarirepilibirugovowudas.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3pkll98koptdghp9dul8hvfdv6/56846590612.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/zawosaz.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/46fd3c950d9c0efa5b1ef00ac5b96d81/rifowufaram.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/xepogu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d195e96d9790983c4e63435fdba38a75/59728232557.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/7a4a406e52aa2a4ff4310184946977b1/gusova.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/8qe6tem65s4b3ot1g1g6erilrq/7966061260.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/15637331381.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be0fbaf114---13421282257.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/25588019877.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/966094f0e2f639395ff86d4718dbce6b/kemob.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bede85561b---kelawokoxafikazif.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/4872852073.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071f7371576a---fosakaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+worst+cars+to+buyPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001653c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1653C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D4E 17612 bytes
SHA-256: 270d6eef650d60a63e6a3900a8a3042ee81424bc0e2b1cf7902fd620cabbe659
font_02_sfnt_off0001aac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAC4 10488 bytes
SHA-256: 8fb80d338d6ce154a56d033656fb256505913fb948bede7359700b5077eb5347

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