Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be7c8c688efdf89…

MALICIOUS

PDF

135.4 KB Created: 2021-09-02 15:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6785915264fbc54fa21fcc2247134ef2 SHA-1: 0ebf5f519d1ea42e003f69e58fdbbce1fc4ecd5f SHA-256: 7be7c8c688efdf89a40724b97d3e95429347c96a7d9deb99ec7b1dcbad0af15a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, several of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://thuaphatlaihoanghuy.com/uploads/files/gizutovoregedutaf.pdf In PDF document text
    • http://worthingtonpark101.com/userimages/90630875226.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/91363486338.pdfIn PDF document text
    • http://esistore.be/userfiles/file/63287287343.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/vomasisu.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/thikhhbdrikpn2d1f44i9legbt/tekepez.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/jafazulotujerogiwo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118c8779046d---58343515535.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/giet1olqhq2d7mtfk01n69tv17/jojefubuvikiwufosomo.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/zusutudilodosuteluxivu.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/58654959136.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/ludavinumem.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/zozaxogexijomuluvivobaz.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/26557446528.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/gupapemijijilol.pdfIn PDF document text
    • http://splogservice.ru/content/file/vusimarazigozogusa.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/xuvisanigimipuz.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/guxetasikuna.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1623785326087.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/31569504250.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b57abc286---fitasume.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/89592279456.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/58db7265a8dce6f8a0c3645360388d60/xusadotik.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090f120872a9---mebozewaxujapisokobus.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b90acd002dc---96177104229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hilaire+belloc+books+pdfPDF 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_off0001aaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAEA 10636 bytes
SHA-256: 7311e76be0bce768a426942f57040313195aaa8ec139dce5c83819d66b5f669e
font_01_sfnt_off0001c313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C313 20048 bytes
SHA-256: 9d58dacce20da9f03f8ba7e807e6a19060288059cc8e6aef7bf0487010816fc9
font_02_sfnt_off0001f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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