Malicious PDF — malware analysis report

Static analysis result for SHA-256 385ea7dcec7fc315…

MALICIOUS

PDF

73.6 KB Created: 2021-10-04 10:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53513dce554d195f93021ad2ec8b96cd SHA-1: 7295b95afcda64e90bdb78cae906ebbc8103c1eb SHA-256: 385ea7dcec7fc315466120394fc4f574551e71d94c54c24ddb483a709e0d62f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous unknown domains, with several URLs hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 6

  • 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.
  • 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://vonia.mikludava.lt/images/files/29446995063.pdf
    • http://novichiha.ru/pic/file/mokarexaxevilepa.pdf
    • https://bongkartuantakur.com/contents/files/bizafababevagezek.pdf
    • http://aokunoil.com/ckfinder/userfiles/files/wujidokisewabeviwal.pdf
    • https://taipeitccia.org/CKEdit/upload/files/maponosolotomok.pdf
    • http://union-montage.pl/userfiles/file/mumilubobizo.pdf
    • http://dydlhx.com/upfiles/file///72431745281.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139349aabd08---66487660259.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/zilam.pdf
    • http://qlionshousing.ca/userfiles/file/fakajo.pdf
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/87361843447.pdf
    • http://sdsenlex.com/upload/files/powiwudiligevesuriteros.pdf
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/faludu.pdf
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/sazanimegapotegojelijomiv.pdf
    • https://lenaoyunlar.com/calisma2/files/uploads/64108396620.pdf
    • https://exam11.menapoint.com/app/webroot/upload/files/lasujuwow.pdf
    • http://metallpress.info/files/lebevewavogozowedirirote.pdf
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/nadatufasasadax.pdf
    • http://balony.dmuchance.eu/userfiles/file/limewesarokoti.pdf
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/durivixedezapu.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448e2c8a5be---78691363737.pdf
    • http://1000projects.ru/upload_picture/file/21401655176.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/29b1b8798666e88b19b57b21b31d677e/27936462290.pdf
    • http://canadianartistic.com/userfiles/file/rugolorugenukogomebolav.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16144d19c34458---11020923405.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613983f136bae---58761864266.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+american+experimental+writing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7cf.bin
a7defedc84ca1971e7bed0b4d87164856ca2ce83e8f7af5150ec3dd59bf78caf
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CF 10836 bytes
font_01_sfnt_off0000d0eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EB 16792 bytes
font_02_sfnt_off0000e8fd.bin
683128e7fa07da19a8a2a7dddc0518ae6f481256601c10e24a835027e719411c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 18668 bytes