Malicious PDF — malware analysis report

Static analysis result for SHA-256 500ae116c0c2e6c7…

MALICIOUS

PDF

77.4 KB Created: 2021-09-06 20:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd80542a333bab6f7276dab6f31e9fbc SHA-1: a6642274c7267489857771c9070b6a6392589de0 SHA-256: 500ae116c0c2e6c714d1bf736fb6bf4fc3c62ee41b350fcd218aaab7a0de32a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, suggesting it is used to distribute malicious content or redirect users. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91dc0c8f73---mozebizalorexoravamalova.pdf In PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/batagarurenofagepajal.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd0435cc55---22474422272.pdfIn PDF document text
    • http://i-dron.cz/data/file/51428628480.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/zebasuseg.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/nabatusapebagilazenod.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/1484255461.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/43445749420.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/pazefalumibinatewajapi.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/49478749599.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/85435592277.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/96950197534.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b068abd27779c5a645cff98337f4fa8/51840187155.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dfa6c7304e3f165a38a666e63d541e9e/31025124132.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/77167270362.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce8fecac55---28685062604.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160730e8a9769d---goxotiwesapetat.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/movono.pdfIn PDF document text
    • http://healthywithhart.com/res/file/52101880471.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070b8d281cab---34327684430.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/gokigixodiwudaritun.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/28167143361.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160933655eb0a0---54377507217.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/61450415538.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/73419796931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=y+vowel+sound+worksheetsPDF 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_off0000c9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE209 17792 bytes
SHA-256: ed93a8bfc35413f76938ea26462c043403de13fb623447b8cf75d47350be5baa
font_02_sfnt_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 10420 bytes
SHA-256: a57a782e1407e355ed3ceafdda0463e8b2928854a9f14eec18c3be8e3394d502

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