Malicious PDF — malware analysis report

Static analysis result for SHA-256 e580a2ac96144a62…

MALICIOUS

PDF

83.7 KB Created: 2021-08-21 06:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4149c0cf50e78b194b608249d7d63e0e SHA-1: daedfc49a3336358142418bd07ba3b2d172e9ddc SHA-256: e580a2ac96144a62aa78b687ba19a70cd2a865e8877be1e9290ec7053df13313
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many hosted on compromised CMS upload directories, strongly indicates a malicious intent, likely for phishing or redirecting users to malicious content. The ClamAV detection and ML classifier further support this assessment. No specific malware family could be confidently identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5398ac922---bitokunoximufutopa.pdf In PDF document text
    • http://fiumevivo.it/userfiles/files/70251939992.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/panakojaziset.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/18848261996.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e3d242f5---96730149806.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210610070054.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/gabilipomilazasuxumimiw.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/62b2771b7b223d5fd29ef19b18380f6c/20154967417.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/53bed24b0a1558f73e6f4244f04e2d82/limiwiragosav.pdfIn PDF document text
    • http://sciattella.net/images/file/gagoragijugajoxasigekud.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/xesexenudejateruregovoj.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/xekabibiza.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/forejudelugobifugidagezor.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d51f432bbc---40255445421.pdfIn PDF document text
    • http://sireny.net/share/files/19816683922.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607997ab348f0---jijuvima.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/212b94920e62878b5abc3fa3b1b36c88/26011353268.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d52094fc35---xefodizotegas.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de7477704d7---bunudezikivunu.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/feradifafinesamiluzul.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cef238faa---tewibovemaguzamelabupiv.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e3965db9a---tumugiloxuxabajumobatora.pdfIn PDF document text
    • http://santeh.md/img/files/sedusowofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=structure+of+the+earth+worksheet+answersPDF 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_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 16568 bytes
SHA-256: a9114f8e205630e08f33b765a4fcbec2aaf15f66395ba59cde9d6882eb4f21a0
font_01_sfnt_off00010fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 10648 bytes
SHA-256: a4285beb69a4aca269f7f122cdd227d6db44885ab98d198d4da79ff4f9773697
font_02_sfnt_off0001282c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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