Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff6c43e5556967e…

MALICIOUS

PDF

94.6 KB Created: 2021-09-05 18:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 22993a209fa67627be62d989bfc722a9 SHA-1: bce4c2cfd03253588ed71147e91aac37ef0ac360 SHA-256: bff6c43e5556967e364a0e90eea251ddbfe7769b360b4029ede4e6dc07ae0616
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and link farm characteristics points towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/72e39b5959c8b8a7db1240e33d5f7acc/demoropuga.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a539de36b7f859a354393ba440dae5ab/13084656783.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080995c084b0---kebegib.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/xiderikowojovani.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/tisalufawinimadezireka.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/kegibamoxifesej.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/86294533967.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/eekiob6472hjm4otff8tmprlu5/ziwiluxokoko.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/b82475df681e51b3a71838f0cdbdbc61/jemusufajiwu.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/94594640073.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/dakizofifisakuvafutowaxap.pdfIn PDF document text
    • https://gangnampools.com/contents//files/61925385260.pdfIn PDF document text
    • https://hgb.se/filer/file/sipumofewudemoboli.pdfIn PDF document text
    • https://drsoleimani.ir/userfiles/file/govagoxe.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/rpnldo72c01ln32ob4mp1i1dk0/57895049858.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/buxopalesagafirinadewajij.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/raxisawibowoxixudefa.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/nifolan.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/95fde38686071bf48577afa57ee8494c/41757028218.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607989503adf1---84402953105.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/7632685471.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/43654462922.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/94656236407.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/33131204062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=manual+de+usuario+vista+48laPDF 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_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE2 20580 bytes
SHA-256: eefe3bd2b1bdf68f6a2182c6837dd62f273ddca5288bafdff59ea60a335a1905
font_02_sfnt_off000153d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D5 10684 bytes
SHA-256: 3d10f0e7064dd40d73d51583955215a7babb344faa8f6f9bf907cad80acf9b45

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