Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fd92f669e33e55…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 21:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3887b558441f679d1188f20d0b04d0b2 SHA-1: b6f88fb3297ad0baea406cfbea04853e02cbdd8c SHA-256: 28fd92f669e33e556852c1e758090cd6a9f3e516953ea6f6098b829e8c9b86c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=adagio+piano+sheet+music+pdf PDF link annotation
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43d24538a8---gumefawumukevaxifuk.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913e0d90079---selupaxasi.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/16bb9907b358b086fdb28e72a9df0fa6/36778788490.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/34840893089.pdfIn PDF document text
    • http://maxbrio.kr/files/files/22493358132.pdfIn PDF document text
    • https://network-italia.com/file/xudatov.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160742d34e3578---ginujetajoroke.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/32897983134.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/ruxozadefivedujesesa.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/jololobumuzejurutawude.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/3973869543.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c404f4f2f39---89665672560.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/eb4225c015c8009b6819c5961d2b26fe/tigevukebetatubudeliwo.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/movaxek.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/27040311394.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/338731600.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/8405a747ec222197dd9862e5d55512c4/tabizezudotuvogupotas.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/xapuduzovasazuzuwuk.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/wulikizomirun.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/df1e5c27c47c36e97fad91f0bec032bf/sunep.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/slhp7t3tmgah8oubevjq1ned3s/sebeseginisiribuxiv.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/zafutixibovalekifixe.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b3447503a---pewuxome.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vb4ktso6i8sgbtghe68dd4di12/zimikezulidakewefitoxe.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/3544165159.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEE 11004 bytes
SHA-256: 91e18527c6e55f1de0ae32e005b3a1eeb9c27b78e46f5b0b1886a47979523bcb
font_01_sfnt_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 17292 bytes
SHA-256: 6a045a4249b5967b2ba0e3d09d8363cc0b3e4bd0d70325d67ba4915274d7a3ac
font_02_sfnt_off0001054a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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