Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8d8c57647efa6d…

MALICIOUS

PDF

88.1 KB Created: 2021-09-10 12:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb176c71d204eff6dcdd7d7225eb9bf6 SHA-1: a058b74dc0c94b2bcfd7829244052eea36ee4762 SHA-256: 5e8d8c57647efa6d5507391bfec035271b1eb0f514aeff18841a34b973fa3688
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malware or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crewmak.ru/uplcv?utm_term=vidmate+update+version+january+2020 PDF link annotation
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161351288f0843---kedaraxiz.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360396c8fce---jokebazebabagupajitadika.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/gufez.pdfIn PDF document text
    • http://cbstav.cz/file/54116285171.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/49820865191.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/kikijijanif.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613424ca9a5db---75143185472.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/vafupokipuw.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tumopesemoseb.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/28536421084.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/67779841285.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090917511773499.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/lerutodakena.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/68475103382.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/wupebop.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/zajere.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/4042934507.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613506aa26b61---30796587118.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210905_452DCD1D459E51C6.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/paguwuzalobew.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/99991100251.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/rirunevifafojuzuxixam.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/1963157514.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_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 11128 bytes
SHA-256: 08deac787447b2a571e23cf619d00e25fd17e1c39defdb38ba76802c160c249b
font_01_sfnt_off00010e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 17192 bytes
SHA-256: 8ca2bed760fbeda48face964df14b7c6863b2bc4dfbde7df2fff305365259287
font_02_sfnt_off00013b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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