Malicious PDF — malware analysis report

Static analysis result for SHA-256 98710a4b0966d989…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 15:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b377f1a6de17b76620cb815b9175809c SHA-1: ebbebcc90a7575cb451b6c99d152efe48c13bfec SHA-256: 98710a4b0966d989f3a37400b19613e10e9dbc8e69dcd10e30bec4c90d84b037
176 Risk Score

Malware Insights

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

This PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://philabc.ru/uplcv?utm_term=sign+word+document+android PDF link annotation
    • https://chp-travel.ir/data/file/86855061804.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161309f7e68b0b---zegixizufepirabexegadu.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/29669094142.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/zozesuwetatikax.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/75684838561.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109171355243134.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/86789322843.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/55343432035.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a1928a6f64a1fa8d31fffd94312ee27b/11493861982.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c7723c0f---vupijupirofizekeku.pdfIn PDF document text
    • http://skncn.com/u/files/60915443714.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/61244926729.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/43644942355.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/34290564673.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/27350840626.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/wakumaxorowobetoxatowudir.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/43831888456.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/ririlutaxewi.pdfIn PDF document text
    • http://artio.pl/files/files/14806259622.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/larutedusejifuf.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210905055126_243025399.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/95935441997.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/74799536031.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/60693372121.pdfIn PDF document text
    • http://nscenter.cn/upload/files/rexoji.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_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 17812 bytes
SHA-256: 3151edb505c31b2bfdae04a45026761b7263cd59adbe1b273889e0e702809993
font_01_sfnt_off00010cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D2 10760 bytes
SHA-256: e914411937c3b29442ba5155b3626f7669068ef0488d2933c560eedeaee08a39

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