Malicious PDF — malware analysis report

Static analysis result for SHA-256 71585e0886fcf958…

MALICIOUS

PDF

77.6 KB Created: 2021-07-30 06:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79bfaf381152ab1ad6fd6ab88c6419d9 SHA-1: b37a025d56a1e30d355de6ea9c4174f01c334d38 SHA-256: 71585e0886fcf958433691313e9d62df0e73221bb807edc91c63fe053045afd9
154 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 functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised WordPress sites. These linked PDFs likely serve as lures for phishing attacks or to deliver further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9690

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 https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/6sp8pdegkt5j5paursfve0hs31/55777777418.pdf In PDF document text
    • http://apnorajasthan.net/userfiles/file/xonenojutijore.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee51d04d267---95261516779.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/jorujet.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/3749183986.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/jfvs4mb2s3kf5foef0mstk98pb/kijavutowimebawur.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/72798445055.pdfIn PDF document text
    • http://cutskytools.com/d/files/zamomowowitexejo.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/d7b273388b045f294f7ba5cb67ca7b72/numolufe.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/706270d2e2e761bc9ba328f9044bd6c0/61562745894.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5afb30750---favisosowewofiwigapoga.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1700146a7---8477930560.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/19544073766.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcdbbc0837---2592499500.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11533279685.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/3e83ded2ee175a9ac26d95ae4c67e700/96713936042.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adbbef659b2---telovasibetojune.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/tasogerigor.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/neroxikududozekaza.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/xiton.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/kisum.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/mifugijas.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/3bd931a70562988df974784adf66cf80/tarezimopunudubo.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/xobisukiporabezaxenogu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c02b75d8ff2---megug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+link+device+to+rokuPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 17456 bytes
SHA-256: c382df0bdaf6b49b990084bedb3133151b75eb2dee94b46e79bc22f711f0eb60