Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac3fcbb5353271f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 12:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a919c12451da07ccd276f595f5d8bc6 SHA-1: 2c0e420da19ed05c3811d0de83591b422eeb71c0 SHA-256: 8ac3fcbb5353271f92517035abe088b1fd3e460c6c35b5f0e6223f5febb3f101
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://pistant.ru/uplcv?utm_term=the+dark+knight+rises+lite+apk PDF link annotation
    • https://ijpdua.com/contents/files/83114389117.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210911233407.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ece8d08b1f---59722130198.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/gimufabugarotavuw.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/sepili.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/130938035396.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/37861120790.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/robewibo.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/ruxenaduxivanok.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/43444209922.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/nirivezegarema.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/raloxewiwex.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109040350365883.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/32754981333.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/majale.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109072027498144.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf15e2a87---sugos.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/zobuliluxepa.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/gufasuximoxodisevo.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/12650208782.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/zipenusefexape.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/75642579952.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613abbf5bf729---19694911197.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/91196174977.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 10608 bytes
SHA-256: cbf1c3c09c3fe3565e160473a64129033d403b2c41cacf66c8e04664b4a5de55
font_02_sfnt_off0000fe8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 22692 bytes
SHA-256: 67bd4aecce370875038666acdb8af85595824eb11337f1cdb29d57767c568b66

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