Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8172ae996d0fd36…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 22:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e7c158c5a8bcc99921d20e3205a36082 SHA-1: c5216be866135c3180e64c2c42c10dac02366dbb SHA-256: c8172ae996d0fd3665c18ead56740488916eeb8e0c997f9b65221b17f1d19fc0
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links, likely to lure users into clicking on malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=up+movie+free+download+with+english+subtitles PDF link annotation
    • http://secureyun.cn/uploadfile/file///2021091603355420.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/gigixezeduputuravoxewug.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/sofiberadulupavikewete.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/57336982592.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/61141339718.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/79578049639.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/1d55b56ff6a6a6d8a2bfbbdd12296f6e/15827646742.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/pozakazofug.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210913145929.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/rapudivulojeb.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/darosipax.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210904_228CAD76EC88E541.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/ralepaget.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/kmthl4t09n3n36m3sun2b32mqf/buzajovojibunulamil.pdfIn PDF document text
    • https://anakmeong.com/contents/files/76675064265.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/66193619100.pdfIn PDF document text
    • https://ferropula.hr/files/mawatigumewapurodadud.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/divogerom.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/pisobokesetuzesiwibopukik.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b910509d6---rovukiregomogomupa.pdfIn PDF document text
    • https://akemi.ro/hirek/file/gutejubogo.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/67930799026.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/75171942537.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_off0000da99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 11344 bytes
SHA-256: f30df77efa7f9a27f2ddd3b51f1006691250f7196b37bc8fc69fad893d6c3afb
font_02_sfnt_off00010cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC8 17780 bytes
SHA-256: c791bc183d2da757477df23e1920c031671ff5e1cb12ec027c091bfd951e42f2

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