Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a2e52f613e3ea2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 15:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aae21e386b096ce41846e6f82d083324 SHA-1: 9d009644098f5a749eddfffbc3cb73862292eeac SHA-256: 89a2e52f613e3ea27b13a97c33e72fd9ee6edc3e0951044f494c4d645a5e38eb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the overall structure indicate an attempt to redirect the user to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=modified+rankin+scale+pdf PDF link annotation
    • http://abwjefferson.com/uploads/files/xupizubumavitegu.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/ratiz.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/4309423677.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/tasasusudobilolu.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/sewiresi.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/40098081624.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/536c49bcd1fc90461f0fe259dc46b3ae/gowasugakimeji.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/57887081208.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f012842830---danutemesozuzalonexat.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/46837293957.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/pojomumasonubizagizesomo.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a8f15485b36f1298ac9192a5169f7024/5285171228.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c955b3e4eb---81845785781.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e9d03ee9f03f83dff42f804ac26e0e1b/kezekezanu.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e2cb4c22103fa39eab42648ab42d4398/bivaxifi.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/zelapotapis.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/pisep.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/tufinu.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/31967065522.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/lolobadinuputoli.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/rovizijojagosomu.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_off0000d9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 10600 bytes
SHA-256: 76bf662407095109373f37ca88b28acbd25e634fd6af74263e2ed3a5ce221bab
font_01_sfnt_off0000f234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 17044 bytes
SHA-256: e6130da9d7de4f67396a81c8974863712ac46535787afc96627d136013ae3dda

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