Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcd84d103dde425…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 20:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da724e100ebbd3c60f6029b65ba8f59c SHA-1: 957aa18c10a7fcf3c6735f6f0b3197e6949c7144 SHA-256: 5bcd84d103dde425c82e89578ecf5ff1c871e015f0e917206a9ed186f9fa90ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised CMS upload storage and disposable hosting, with one link impersonating a parcel tracking service. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs suggest the document's primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://smidgel.ru/uplcv?utm_term=upu+parcel+tracking PDF link annotation
    • http://bluecars.pl/userfiles/file/piwagufevukipoju.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/57bf03796cbe44323cae6835824807dd/gomamimonajopanukiduf.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff22cfd3637---fufevumevob.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/mmapc1j9jfcsvd6ihgil2mci5i/jifepuxikokomisibobu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a64761b94ab---jaxidejosajewejavidasu.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/81fdmmpf4o3lp9ptm5taiod1p1/61005465057.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/86978702742.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610a0250ee232---25762576877.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc99e921d51---48005906494.pdfIn PDF document text
    • http://elskenecologie.nl/files/tetigorupusiguk.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/81031138839.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202108180504429914.pdfIn PDF document text
    • http://ipceurope.com/assets/file/1521731146.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/54344321219.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/vaxizumuvufixonuvid.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/9524272754.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/92966884460.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/kexabudoxele.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126ab3cadcad---60044267216.pdfIn PDF document text
    • https://clubon.top/uploads/files/towijedobajixexigebomi.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/zazumegimebisigobuvuj.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2a0efeb04b5d2da4f5d7a41c259b87cd/foladedivofuzilavir.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161068d76b3c07---52288080475.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/mepubasanadam.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/8nls1rkno47906d1vuqtdjtv67/88539524716.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098010f8f9d5---48325572830.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_off0000d00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00F 10460 bytes
SHA-256: fdb7a2b2b64d72b3444623e3840cf550c2fb2b876dcbf830bb23d4bb2686547e
font_01_sfnt_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 17400 bytes
SHA-256: da8c65474dc4002eebb161445a9c26046592e72d336d86e1f98ec6a9bbae8f92
font_02_sfnt_off00011548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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