Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99c8b6b5ad38631…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 19:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02b357eec6eaa19b6f72527075973305 SHA-1: 1e5cbe85ce4f3956a871b7701119f24e14b3eb44 SHA-256: a99c8b6b5ad386315c305616b7e1d246a09812f68bb8a976d9530bddac790933
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms, increasing the likelihood of phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to download and execute a second-stage payload.

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://ketchas.ru/uplcv?utm_term=roblox+studio+android+apk PDF link annotation
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/10508918245.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/vedogudivoda.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/91064604058.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/dorimowunevoforemibome.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/32668396641.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/3264755358.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/45522870354.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/filunododazilufapovokul.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/90059549576.pdfIn PDF document text
    • http://ruihuitax.com/files/file/suxesusejifutidiwur.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/zonomofojovewijeji.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/61742294771.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/78418011208.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/99d16c01b44e6cc4ee22eb6816f75259/gabalogunetafowubafudunij.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/16013652701.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/muragumijo.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109151046389544.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613050370ce43---mofesowijalewatega.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/1t0fie2hem34bcvfo4ap72ksl4/ludesikanazofikoje.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7bfbcd91---lozuzopesufobebede.pdfIn PDF document text
    • https://latework.cz/soubory/41401176010.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/59182713727.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/59508350226.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/xexudorov.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_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 17616 bytes
SHA-256: a33715dca9af36f9c2ba38153bf842097a02ba01e1b71b008a0ff33a3eb32bcc
font_01_sfnt_off00010b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001231a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231A 10732 bytes
SHA-256: feaf08a2bb3922a91b42fae0812bef32f33cad552bce20a06f7ffad90601ffb9

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