Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb071700997b4c1…

MALICIOUS

PDF

84.6 KB Created: 2021-08-19 14:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9045a750dec5c3cd3acf2459101cbbdd SHA-1: 8c5904983241e30954a7adbe95bc00c3e8a58c0e SHA-256: 6bb071700997b4c1d4a093f9889c410a561a1cd823fae854628d1a40ded410d3
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a6d5c02b254210b04fa0f0cc27742228/14484776554.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa1dc7dab2---20085044838.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/aciqm5bc402sd2151fpqcqk8bp/45219071050.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/debitifowipa.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/mitezex.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/simiwazefuboduzafopakumos.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/28455414815.pdfIn PDF document text
    • http://cl-pub.com/files/files/86252188443.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/13145307879.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/77792070979.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/e375c5f01d3f62c416319c8e35be5859/18410896513.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/32ca0rkgm6bgun6ap78rkn3vrb/55483765232.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1ca241f748f73471f2faaef12f511ab3/pipudaxam.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/c7juqg9tep1622a31smnn7di07/70225173249.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/71837620546.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/2244792707.pdfIn PDF document text
    • http://apcmagon.com/userfiles/mukoxabaximuzoxibumusiba.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ade9fa27732---16179924991.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/lufemadab.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d24324c7---14136153968.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/zeniritaxefigokujixoz.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/81967061178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=epic+fun+run+3d+games+unblockedPDF 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_off0000e3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 11352 bytes
SHA-256: 27afc837a680baf6c5118ce1fee096fcedcfff95af22895225f4683dbdcd9fc2
font_01_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11622 17688 bytes
SHA-256: 90ecc50d013a52d133f6eead3dd9e2ff637eb1facd963e0c05ff604489f60fbd

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