Malicious PDF — malware analysis report

Static analysis result for SHA-256 747cdf546e001a6e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 15:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ae8c5c52b6d23731e882502e5434de8 SHA-1: 916184f87f5fc1061a5c45a88a4ded89f7117779 SHA-256: 747cdf546e001a6e6e98dcce5826ef4b11bff9e59bcac1a1652e5313b55625b0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple URLs pointing to compromised websites, suggesting an attempt to deliver a malicious payload. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=node+video+apk PDF link annotation
    • http://dzirerealtors.com/uploads/70887730190.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/baxufilos.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/23210814335.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/77470008596.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/95224191825.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/navotojozemezi.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/25297398956.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/dusiw.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/89921253578.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/wozakitoxeru.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/87201802602.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/juvukagukof.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f82e81647---xexalenibafirap.pdfIn PDF document text
    • https://koratspring.com/upload/file/pesazukulelewi.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/24580408212.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/6707211217.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/bofupixubeninija.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/54713887278.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/51500021987.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/77350042676.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/33061578831.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/87923692987.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/midelarurigivige.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/849a38ec139735ca55ad9efd1347ad03/rodusodukupedumirafuvamaz.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/62176863256.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ou156th0q6l2aoi3t3c8bbh4h3/ridesilavutebuxejulijojej.pdfIn PDF document text
    • 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_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 10004 bytes
SHA-256: 14e4ea3fcf8467a3b9c8ab751d5b28fa28fbc980c72cb4be54ae075ad6f1d6b7
font_01_sfnt_off0000f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 17768 bytes
SHA-256: b2221fbc584ce4aac16fd009bb45958191692a92cd24ae0063ce5e8b33fbc907
font_02_sfnt_off00012616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1