Malicious PDF — malware analysis report

Static analysis result for SHA-256 9393ea1e1ffd5b0d…

MALICIOUS

PDF

503.7 KB Created: 2021-06-29 20:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c08d1cad277ba586c42a9aaa90bdc308 SHA-1: 27c926f14fe4abf53a0936564d3967a17f5bc5cc SHA-256: 9393ea1e1ffd5b0d06a9ec27dff9932b4eba9b37ea47ff8c6b386e45972558f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated maliciousness. It contains numerous links, with one heuristic specifically identifying a link farm pointing to compromised WordPress upload storage. While no scripts were directly extracted, the nature of the links and the phishing detection suggest it's designed to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7698

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.
  • 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 http://alfonsoguiggiarchitetto.it/userfiles/files/7677463765.pdf In PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e9edd3621---pifolis.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/qmubsq9g3mep51p9h0ghltrfqa/luviluzovif.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/2689518475.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/b2dc2c001a26fcdc97495150be2e23eb/54448741363.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/q92jbdn71mis2k8ocmkss83sc4/47354005769.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/xogolorafidagironubugadop.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fdf6c2eff---34006548397.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/balusexav.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/16832511930.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/cqu6768mi3tdelb7u2kk46sj9k/tumufekigiwozajudari.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/jubajak.pdfIn PDF document text
    • http://hodori247.com/uploads/files/begiradafu.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a7f633f67a9ec4c6ea28c9c2611fff43/12317027191.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/ziwugepuravob.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/vaxigapojoxurasofopiten.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/21950098135.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609884cdd5888---menewova.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a25ef8b2b9---1278635904.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/807d8cef92072c918682576be9fa70f2/41987947866.pdfIn PDF document text
    • http://hzqzg.com/d/files/60822838420.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160820493b3611---90045931737.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/81dad313fe30df4cafdc4ff4ffee9e70/guvinupajesefejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=essentials+of+materials+science+and+engineering+3rd+edition+solution+manual+pdfPDF 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_off0007660b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7660B 11220 bytes
SHA-256: f3a24dfb0ebf85e3a7f9c3a22a7a60673ff0de643cf7a9013d4352f56247f486
font_01_sfnt_off00078024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00079836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79836 19812 bytes
SHA-256: c8444e78841487b6e5fcabb92715b6377ac9f4142aa03919c25a3a39961cbc06