Malicious PDF — malware analysis report

Static analysis result for SHA-256 7195824a1b77f368…

MALICIOUS

PDF

87.3 KB Created: 2021-07-17 02:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8922ddf4b77bb3a4fd34374d72a79721 SHA-1: 34a7356545272a16a8a7ad46c13f1aba026fdc7d SHA-256: 7195824a1b77f3682d0bca4b41b08fa4408e9272fc7fcacb63fc7bfd28d29f3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on compromised websites, suggesting an attempt to distribute malware or phish for information. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination of the links. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/30224c79fe973b416ee2e1d4a93585a8/49412045741.pdf In PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c37e216511---ladikogasok.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/noloxisevazekorebut.pdfIn PDF document text
    • https://roc.mn/uploads/files/titedebari.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/rageduzep.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776e08667a5---puzunozobotimoxoxufomovux.pdfIn PDF document text
    • http://st03.it/userfiles/files/pepilepenamamitevori.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/tovixigopa.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/nulosutigonutibot.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/74614285405.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/50303958136.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/65585391335.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/pedelezobexomitisot.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/13ec46f7021a98576f209af61ee887b6/nunojedutameweduzin.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/27732831355.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd366a8da---99771239043.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/96751878396.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/64123146642.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/19123028673.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/wumemo.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/30292584769.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c484a94ad1e---60160394040.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ac816da5---fadisuvol.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/56628749171.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/41232103174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=oxford+english+dictionary+download+pdf+freePDF 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_off0000eebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 17748 bytes
SHA-256: ae80f114e99c609ba6ff8a06b0c7c9078d39e2d0554b8bb39f8aee7baf993050
font_01_sfnt_off00011d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 11224 bytes
SHA-256: dd0ce3b80b914b1c79fab0296d0e729cdd93bb8f3b6831e18f01c3101bfff275
font_02_sfnt_off00013767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1