Malicious PDF — malware analysis report

Static analysis result for SHA-256 e893a13000a75594…

MALICIOUS

PDF

92.3 KB Created: 2021-09-20 16:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 431cbe9afc9d5e12d00e7f161dcc5032 SHA-1: c5740afe615f0e854c4defa472ad6877e7732432 SHA-256: e893a13000a755942baabce8b42bacec9e5ac7f6525d2b0f60d59993c7d11070
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by multiple heuristics as a link farm, including one indicating compromised WordPress upload storage. The ML classifier and ClamAV also identified it as malicious, likely phishing-related. The embedded JavaScript is likely used to facilitate the redirection to the malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://strategieb2b.ca/userfiles/file/40419486605.pdf In PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c4655878---nezozajinezufafi.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/81328906769.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/pakujoxapopizisewuzos.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/85773088556.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/matip.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/ziberalixuwejazewirakepe.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/76541028617.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f69a0ee597---94918601538.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/29670682653.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/82327505772.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/faxavot.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/rumefitulane.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/53571768536.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/gufamabidi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161425dc750711---13152269681.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/61007236346.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/q1q28ldb9vsvuesp7ai1s4hoh6/17493039014.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138e6c9372d2---nediwi.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/25347109216.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/52928ccd8a410d085e9d1ed58ec6967b/dazunakek.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/94878444917.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/nojisewodubaxisura.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/supoxafijilatapej.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/75940114731.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/22489458894.pdfIn PDF document text
    • http://atoutslegion.com/userfiles/file/75439277031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+messaging+app+for+androidPDF link annotation
    • 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_off00010630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10630 17168 bytes
SHA-256: 2c5d4038fd971fa3c06d36bad65a409b5e501448fb5e1e72c530f161be128cdd
font_01_sfnt_off000132a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABA 10848 bytes
SHA-256: 6469f365cc0a8e06ac880870c7bd8234ade9684dab478a17f7ce4add7b04f486

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