Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e88263e97acbbd2…

MALICIOUS

PDF

136.1 KB Created: 2021-07-21 03:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 71506540619e0ec27b516733f1231e67 SHA-1: a6b17a0a314c3b7e3f3b7df9571055dcab143b4e SHA-256: 3e88263e97acbbd257e8adfdf7a1322cba22227b28423534fa0a040b8010debe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to lead users to potentially malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f0ad208f9d04ee6e610693fedf6e7266/94829125047.pdf In PDF document text
    • http://hkalc.com/userfiles/36698356090.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/7f37cc827ddfd9b74f7392b7bec4441d/32609268022.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a88c7634039---xamenojegotuwivovijuwux.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7040b8cf77---tenobes.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e3448c22e---pexadevuxutufuxuwejuk.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3070d4aaf3---34740227054.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/sisekibege.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/iis3gm2vjtoekjgohtvsjl50l4/39620445924.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/dapaje.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/48450394034.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c523ffecf78---87175931883.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aeadbf30ea6---22817588050.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/dbfljr5hh8i215aaocmabqe9t4/42518230037.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/88703163293.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/ronokuziwimejixa.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3a6ce771d---55941869081.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b26c36fea---47427937000.pdfIn PDF document text
    • http://akssert.com/userfiles/files/78430205170.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec57e20df7---xakifapawufasaxezino.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/lefawezepinofagavutipazam.pdfIn PDF document text
    • http://pneusmarene.it/images/file/bawisuwijuluwilo.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/kijatinajafanoremazidit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mrs+huxtable+cosby+showPDF 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_off0001b309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B309 18060 bytes
SHA-256: b796043aca3cbf57b15450837a626bea3e0f46791d09faee89b64196ac0edc0d
font_01_sfnt_off0001e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E257 10664 bytes
SHA-256: 1dc5ae77e366e668a29388067ccd34f7b4c32a47472eaed8037a6e4353e0018b
font_02_sfnt_off0001fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1