Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ba5330e550658e…

MALICIOUS

PDF

62.5 KB Created: 2021-08-27 17:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c19a2070f40915c2080c775214d112b SHA-1: 0004def496e24d57c2e2f09383b9cc8d8bebcbad SHA-256: 98ba5330e550658e2ba568020c32fcff8a280d4bf5dfb621df90b1e6033f75e0
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier further support its malicious nature. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings strongly suggest a link farm designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6973

Heuristics 5

  • 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
  • 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 http://indecomavo.pl/inc/77012920607.pdf In PDF document text
    • http://sportschoolindex.nl/images/uploads/zegomiguz.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/520f067b3b07f721488cb27d2d130bb2/38166963045.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/nalop.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/88630949628.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/nokuzegababanu.pdfIn PDF document text
    • http://juha.be/_files/file/sitonomikakovapo.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/19376512189.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/bebagetijubozuvenepeven.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/82hgk6g5gec25pvj3jbd2oq8qf/pesuwonudoxinex.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091f0c7c9e0b---gotowizaguriforoti.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/11193599224.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9s3sjjtqbl1nlabvq8qcqjflb6/pebajuxobawubekir.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fb0932bd---xetojivevedasijuxoremikab.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b70e1e95ea276664548ffcab664cd79d/98544139939.pdfIn PDF document text
    • https://andrejc.si/files/file/29668881994.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd04975d5b---fodutotaduxolu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef830d4357---85756263039.pdfIn PDF document text
    • http://fteq.ru/files/file/soduxesovowitukelag.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/2982671638.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/maboxosiji.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/rsc5qlnkp07pkc2j9d6d4lp903/gejinelusar.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/76805961242.pdfIn PDF document text
    • http://jaatkinson.com/userimages/zokojojesedogonorepobovak.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/47879207397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=to+appeal+to+someonePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE434 10184 bytes
SHA-256: 09c61a4ea0d54793fa798986fecdea6d5119348a42951ff3350171b6275507e8