Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a087d9e8d929f5c…

MALICIOUS

PDF

89.8 KB Created: 2021-09-17 08:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6029e7d416b74d61ea76e65b1326cbee SHA-1: b1880bb7e39af9d82b6104be619a419970af6985 SHA-256: 4a087d9e8d929f5ce9b5b96f9bd5d6651a0a3204a98876fd8ef4215220a71314
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm pointing to compromised CMS uploads and disposable hosting. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://tccsrl.org/userfiles/files/40705388376.pdf In PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161352872ed6e8---84951290040.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2ff718c84---98229463838.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/57747629517.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/8300295246.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ed509785---vovumumosoze.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/katasonorepomebavodabaluk.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/26596558529.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/66958408177.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/28161273775.pdfIn PDF document text
    • https://gencatakan.com/upload/file/roraxep.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/14f460560e23aaf0eb7e574d4f671ca1/54757740969.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/zebowibodeteva.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/54121156191.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/takagof.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/072305068056.pdfIn PDF document text
    • http://hongdacable.com/d/files/41497792823.pdfIn PDF document text
    • http://mosjob.ru/images/file/majegujag.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/63458223799.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339bc6d1c8e---bojid.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/23738432772.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/23387916012.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/sabufexexakemi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161341088c0d25---22166985056.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/93741004144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=lahoriye+movie+watch+onlinePDF 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_off0000fc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 17596 bytes
SHA-256: 04feb8c3bc8762fd2248c5e10185d306664f37acaf71ceae4062aa7c46739953
font_01_sfnt_off00012943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12943 10548 bytes
SHA-256: cb2ffb7e0aabdc63d5bf74e740264b014522b6a6039e966a56043a78c13f03e6
font_02_sfnt_off00014129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1