Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8328b173073ae96…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 02:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b96a6ad7e1b68b2cf82365661064f0d8 SHA-1: 30da28bd79a27f58314b0346f54c03d22c32c86b SHA-256: a8328b173073ae9661703785adad22dc41fc61203dad8e99fce6df309b08e6bc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's content is designed to trick users into installing malicious browser extensions or updates. The presence of numerous external URLs, many pointing to compromised CMS uploads or link farms, further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall pattern suggests a social engineering attack aimed at user compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://garglob.ru/uplcv?utm_term=move+clash+of+clans+from+android+to+ios PDF link annotation
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/415549756312c8e2d5ca31b67ea64e2a/xitiwes.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/83904024698.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/diqbp4usve94ar09q7iodi2m15/84237714879.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/9429thtt54im5cq3e0lmh1c8fg/dovajed.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/95391437087.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/15050855092.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/jomemabozewoniwu.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/46721322959.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/37185329638.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/36626792190.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210906051619514.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/69619316737.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/vekapividefunepax.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140d445201c5---bipalasigavaboza.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/bamuxuzatelu.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/zofujixusoxidavavutagakef.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2afa03bb847e520845ed74bb7e1caebb/61828506124.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/ragat.pdfIn PDF document text
    • http://splogservice.ru/content/files/14538973338.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/bilitudurimobise.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109141457388502.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/joliti.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/7346914835.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/6359601859.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_off0000d732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 10800 bytes
SHA-256: a771d166db1070d5d31d21fbfbbbc037ccb29ebb368b3602a8b9763e251737e9
font_02_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 17424 bytes
SHA-256: ac2c0204ecc8ecf2dd1c06a625d4221fb1e1e223583bf45531ecfa9320cbe7f4

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