Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ad456f7ad4823c…

MALICIOUS

PDF

93.4 KB Created: 2021-09-09 20:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 364bd5c3f128b23f443556af8f783e55 SHA-1: 19de919a0fb6362b28435872347ae260e0d4cc1d SHA-256: c1ad456f7ad4823cf6e2a6e37002c683c5cafcedb49d2b28eef22286c14d0c65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://cructi.ru/uplcv?utm_term=the+city+of+ember+free+pdf PDF link annotation
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/fanixeres.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/27517949442.pdfIn PDF document text
    • http://alternativecarrepair.com/userfiles/file/falope.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/nabufenuwazatowiwage.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134898dc6cdb---sawogagojawipo.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/bavadivopitesapili.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210907_7B1BDBFF00A300AE.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/vimorideserakugiko.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/duzexorilipim.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/lomatesejulo.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/92897745211.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/43488306315.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/98172091989.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16137602b86e36---roxenabogipuwalesadixeduk.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/35952650188.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/vupumivisa.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/gaxebiwuxururaripifoduv.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/67540569777.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/45209807900.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/50139818711.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/22097273126.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/7750549396.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/4212158728.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qap0tg5skcv7h42306kgdk50o4/tizimabun.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/3205117266.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/pamubepisemabumukas.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_off000109c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 18136 bytes
SHA-256: bfcc2eb92e8591e29beee222111b9c09eaeb7d8b86ece98d690619c49792cd84
font_01_sfnt_off0001383f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383F 10624 bytes
SHA-256: 88f8248bf9fe577281aa486278fe40845ffa04fdbc344f7979dcbb26ca60c110
font_02_sfnt_off00015052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1