Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a516050770ede90…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 15:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0b415cebb55a11049b6b7b40ad57ffba SHA-1: 34a9c9e7873f68b4f460927bfca6fa492af3a855 SHA-256: 4a516050770ede9095bbb6a0d0bb399a833b2b756ec9e1a95c6b49a380ea5680
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader, likely to facilitate further compromise or phishing. The ClamAV detection and ML classifier strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=popular+games+play+store PDF link annotation
    • http://sloplast.com/userfiles/files/jawarusomolemivanerulid.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/70552b5d7ea9e9b67801f8f1f73e00bc/napogedigowawaxelogabu.pdfIn PDF document text
    • http://njxinbell.com/upload/files/67692622582.pdfIn PDF document text
    • http://parfumland.sk/upl/pigojimozujawajeditax.pdfIn PDF document text
    • http://hzqzg.com/d/files/5402744285.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/41267393070.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/90546165132.pdfIn PDF document text
    • https://agrando.cz/files/file/7611974931.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/45147432730.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/63536952714.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b126cc926---90445762704.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/vixawenixu.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/96755743727.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613281bf39e48---gatepipapinawenakinowif.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/dusizikujipokugoxob.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/96969383388.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/diru7u6b1rbcc2mbldkh1ad1np/kekexisipomu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6ab49c8ed---62602013281.pdfIn PDF document text
    • http://portableandcool.com/files/files/kuwesiluzumok.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fbf6a92663---gawigiwumef.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b3e0946dcbbe2447344a40e3486fc469/pasogovikebunela.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/59921446973.pdfIn PDF document text
    • http://kccmaul.com/files/files/roxixitudeluti.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/25982443312.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/35226938693.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_off0000b3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FB 14428 bytes
SHA-256: 9223b925deafbd09f9dcbc6c9ecb0a3fc660d492e4862eaab2ec33719cb4e408
font_01_sfnt_off0000d7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F0 10612 bytes
SHA-256: bf8062479adba2ebf85010a7564843729d7e73871bfb328631ed82ec4a8c0034
font_02_sfnt_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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