Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c03cd299068f5f…

MALICIOUS

PDF

76.2 KB Created: 2021-09-11 01:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 533877d5ef267e9b0fc9ba4dddab35d1 SHA-1: 94af2587d28e7556642d81134536a79dceaec0c9 SHA-256: 86c03cd299068f5f31e4e2909d1c594b999c7ea081a0bddd2e4d478f05b96d53
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135178c87615---30824714537.pdf In PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ng1d03tnih9ecjffs8n2nvppib/borozaxupamalukun.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/wemagilolenukalerukod.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/natanudogaradisin.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/zumule.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/kanawixelituxoxovijulow.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9ddaea5aa---fanekewu.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/rasakiwexovidetiloz.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/78669894704.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/60709092140.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/kubixevogifidipa.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/96869887201.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090714492096.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/folakuduwigarinituwa.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161334c2a891f1---bivopidomixegenavelu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f49a3f9a7---80415551786.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/firofefuwuxumur.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/bozisopigatomosuzed.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/17083465625.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/47372386177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fifty+shades+of+gray+full+movie+2015PDF 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_off0000c397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC397 11380 bytes
SHA-256: dc9ad8e1b9a6453742c3732838a80e522bf96ba128ba2917c05c8d07cfa16bf0
font_01_sfnt_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 17436 bytes
SHA-256: a272454f65b909a053a12c6ae0d329d429fd957079dcc36b87945a2f0a6bbd65
font_02_sfnt_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1