Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8442de5d2dddd2…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 01:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fd72f00fa3e4c8ce31d4b6b8ea25523 SHA-1: 63454485d61e7ff49c42558adfd163db277d51cf SHA-256: 6e8442de5d2dddd2cae45a0a4590bce1f011bef5a1d44fee1a2af59c20bfd23f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external URLs, which are characteristic of phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://austarpharma.com/upload/files/tegeviwok.pdf In PDF document text
    • https://albizy.com/ckfinder/userfiles/files/rufalenofij.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/guxarenomikekoxido.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/zegisudojemuvalegutizujip.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/mujadelole.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/20d236ce4db9b4e985f150ffacec4b8c/22726122249.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/daninipejibep.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/48777218082.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/42554688288.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/68689304929.pdfIn PDF document text
    • http://4bx.pl/public/file/manikoxekumisinegigi.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/sekarinakorufirirub.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/petegawamuzona.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140826cda6ea---naxilapeduxasanilu.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/56965743641.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/givulu.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/vaninarepiguxebosesu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcdb799600---vugetizuvonow.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/mapikufedenisefosojij.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/kirivawulatolavarubadoz.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2e4277a9---tujagoradanod.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/68032511753.pdfIn PDF document text
    • https://ratosatu.com/contents/files/69245967937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=top+part+of+stomach+swollenPDF 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_off0000cdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEA 10700 bytes
SHA-256: 5a7d64750c240464808c770b6991f1701b31acc838479f0bb97bbb042c9f8cab
font_01_sfnt_off0000e668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 16784 bytes
SHA-256: ec99dd83b920514022d518a5d0244c5e52c51c8f751a2e8ecc9eb4ac5c14c07d
font_02_sfnt_off0001116d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1