Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08cd7ab857a4426…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 02:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6faf1c1f13fb95ea7b704529db26d143 SHA-1: 8edc042fe1766800680c8bd970b63caf17142e4f SHA-256: c08cd7ab857a4426fca31627494a18bfcea3c0377649f08338963d30280ecd7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://chithanhplastics.com/uploads/userfiles/file/4075339752.pdf In PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/xatev.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210907_091439.pdfIn PDF document text
    • https://denimder.org/resimler/files/zunemumuzoxewijojef.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/74015987156.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/87444978367.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/tamogiw.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/jarilerusubiraza.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/nizixapogegikodik.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614455caa45fa---tumajafab.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/92378239312.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/7418428421.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/lixoxuzoguwixe.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/sujijipaf.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140f81bd62e4---64309965838.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147c6798cbc7---42315989548.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/soginosejerusupur.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-18/20210918061441245808.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/goxabud.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/nakipamatubatakokumowiju.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613259473dbe6---15453124351.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/zodemu.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/97409796203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=homescape+mod+iosPDF 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_off0000d502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD502 10320 bytes
SHA-256: 05b713f32a5038a7d589557b13f6944d13713128cc7142312d16b331ae4f178a
font_01_sfnt_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 19664 bytes
SHA-256: 3b450b5ca9c9aa30279034d74aad997d42fb3d658dfc840e101750565c3bc39f
font_02_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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