Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbfa49c696760ec…

MALICIOUS

PDF

78.2 KB Created: 2021-09-13 13:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 250b663249e7ac4e2773d1bd450d2e26 SHA-1: 98b82c9445f06e37fd5c2bf67b0639cbdedff435 SHA-256: dbbfa49c696760eca6fabf8752815eca5521b98ae9a461f473b925312d1049dc
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1555.003 Credentials from Password Stores

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to compromised CMS uploads and disposable hosting, and includes lures for downloading files and harvesting one-time codes, consistent with credential phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading further malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://decoworld.in/dayafter/uploadimages/newsimages/file/99291400243.pdf In PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b22aa1d983bd673f09dc931f515bca0d/manusokunozadilozobep.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/57807187720.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f88234d5f---momezolikaxidis.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/fedarakapimurub.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/31634443895.pdfIn PDF document text
    • https://labelmarket.pl/data/file/mepemi.pdfIn PDF document text
    • http://change4best.ru/upload/file/lifelepol.pdfIn PDF document text
    • https://davnosti.ru/upload/bonamonerivix.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/wimivilusujanigabokalup.pdfIn PDF document text
    • http://wdnederland.nl/file/39651131057.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/53445287778.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/taravezadob.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-8/20210908225845367929.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/gaxusebukowuzigaribusepad.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/dufumunekutoxumozumadixo.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/98061126796.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/55781553767.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/sunumezabezujuvevuretug.pdfIn PDF document text
    • http://scsychem.com/upload/files/65153822218.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/14213585479.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a031fb08f732f0c2d300ca24b42051ff/vobaxipojulozipomek.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161364f6a32509---82771074436.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/17467560661.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/22311307529.pdfIn PDF document text
    • https://tl-systems.hu/files/files/81278244858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gta+5+apk+download+free+mobilePDF 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_off0000cd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 17008 bytes
SHA-256: da8bb47db2d21d530167a25fb21b98ddf1ceefd5dc50185bd6b9bf804150f627
font_02_sfnt_off000111d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D4 10980 bytes
SHA-256: 9a7106615b0f2f526d003c846323a760008035a1bdb1a9cf3fbeca73a175d873

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