Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aebbc2d86b5bfb6…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 07:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98e41e3a5d0eab2893f2153616f3430e SHA-1: 401f4220f10fb654f96b122798083398480ab330 SHA-256: 7aebbc2d86b5bfb67363db8a998a17222f9e0ab7bfbb11871eb2a58bcd646c06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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=unique+baby+girl+names+starting+with+j
    • http://fuerst-architects.com/uploads/file/73475458487.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402c4c3095e---38764626799.pdf
    • https://reniuved.it/file/92326866790.pdf
    • https://conviviodihera.it/dati/upload/file/lobutezafexuredeterujit.pdf
    • http://sententtech.com/file_media/file_image/file/filax.pdf
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/kigomunerakem.pdf
    • http://trip-sale.ru/userfiles/file/80674656952.pdf
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/lovebedemurekobubasikati.pdf
    • https://weddingitaly.jp/images/file/79277628550.pdf
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/95981546922.pdf
    • https://alternatifhirdavat.com/upload/ckfinder/files/pilotinejuvamixuvizumaf.pdf
    • http://sarica.com.tr/ckfinder/userfiles/files/13626645511.pdf
    • http://itkaufmann.com/images/fckimages/file/2579443452.pdf
    • http://recit-de-vie.fr/userfiles/file/mepomasijokixezitogonawe.pdf
    • https://xuantruongtech.com/images/ckeditor/files/94703347604.pdf
    • http://hyundainhapkhau.net/upload/files/sewerizodeviz.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/q48la1c775bif12883jgf30lik/foluvupewuxepowixoda.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16151db2d2bfb9---77795375906.pdf
    • http://abogarestudio.com/userfiles/file/maruwus.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ba17c34e6e8bef5ccb2f5d6b24b6d82c/purabenuvakakoli.pdf
    • http://sattosushi.com/uploads/files/firezolugamatebokudu.pdf
    • http://hoteldarim.ir/basefile/hoteldarimir/files/luxawipigevoridivoro.pdf
    • https://fertilizergranulatorprice.com/d/files/sixigigonenok.pdf
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/76951303580.pdf
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/lumuzujisagigafav.pdf
    • http://talcmanagement.com/uploaded_files/userfiles/files/53678811516.pdf
    • https://27061010.com/uploads/files/202109260806042011.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b67d.bin
a5a9d141055ca0db0c1769ec8da8b6192eda428dfdf68209fd6897ebd02d8846
pdf-font-stream PDF embedded font (sfnt) at offset 0xB67D 11160 bytes
font_01_sfnt_off0000d018.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD018 16792 bytes
font_02_sfnt_off0000e82a.bin
4c5b556b1898acb3fa68bb3c18d4de1ed9d4cb2002d4025bb2460eb742ecbc85
pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 14532 bytes