Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfee0b886ee0c0f5…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 11:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35428b6639a6f77eded1c428ac20feb1 SHA-1: e6290abac1c17f96d2352bc3ab528302d02cde91 SHA-256: bfee0b886ee0c0f5fa26d824ab543ff8f2686ee1c93e1849fc761838d6732957
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=mapa+mudo+comunidades+autonomas+espa%C3%B1a+pdf PDF link annotation
    • http://chaukitchen.com/uploads/files/ritunupemubupe.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/pagonunivo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2ccb8d984---pisaxagesik.pdfIn PDF document text
    • http://novichiha.ru/pic/file/fefes.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ad1f11c2775d9db66c050bd471785332/9953642840.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996afbf2ab3---46603239782.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/xudarowajemetubij.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/95150676354.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75897994812.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/43323576240.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/gededomagaxevaweluvo.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f603573fff---2535332425.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1d380cca---pamerakumujexijasu.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/watonavu.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/18041265464.pdfIn PDF document text
    • http://biomehl.com/images/content/files/vakuwedu.pdfIn PDF document text
    • http://potlista.com/file/files/kapozinojemonumuve.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/o4gs5uqh9dakbttcopjf3q6p0l/91756407924.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/k8ckdqa7eate17pc680vtejdn6/degajaxebutezibusebag.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609287545e546---lavegodaposulesazewazuxeb.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/79012647630.pdfIn PDF document text
    • http://coachhouse.info/assets/file/wetewolaped.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/gobekekoruvemurusogij.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_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 19456 bytes
SHA-256: 80522278837eae2e7048f457cc3f443d6206d89db18f47be9b88f46fce03ac1c
font_01_sfnt_off00010e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12629 10932 bytes
SHA-256: 2e116022eaac950cd9b4712e47785c3624b5a7908a801c41bb0d20fddd91369b

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