Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3ec123447ee771…

MALICIOUS

PDF

68.1 KB Created: 2021-09-24 22:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5773e55e43999e1a646a4f5a8460c97b SHA-1: 0a8c4eacf527d87379e53cd83b3a618140cab322 SHA-256: ad3ec123447ee7719d6f575bd0bbe698c49b7d0621e931571dcbf63af7fa7bff
176 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, typical of phishing campaigns, with a high ML score and ClamAV detection. It contains a large number of external links, including one pointing to a compromised WordPress upload directory, suggesting it's used to redirect users to malicious sites or download further payloads. The presence of embedded URLs and the overall structure strongly indicate a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=watch+free+movies+online+now PDF link annotation
    • http://brezov-gaj.si/uporabnik/file/pumexik.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/sopikuden.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/10442211910.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/62723203942.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/savuwogigiz.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/nevirenepa.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210902223716.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/63810658647.pdfIn PDF document text
    • http://dgkno.cn/upload/16504868472.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/gikulenuko.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/87155530403.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/zexaxizipogijaxoweni.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/35389774320.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/vawememapizedonimu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f0c1dacf25b47815a23673448aad485d/9228031901.pdfIn PDF document text
    • https://micsys.in/userfiles/file/kamuj.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613266e148d83---41061808269.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c65bbecdd---xusekoxixiz.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/fesuboxanitok.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/41583270238.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/xiligojoduvij.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e9161bd39c1e95cde7ff8e09ef3cbb96/74264837627.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/sufagowofavamobimaxowuzis.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_off0000aed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED1 10748 bytes
SHA-256: 45680c56eccd3cd96a160d9c13a0e476e7b330081dd6488ef2a37bea9fd32ef3
font_01_sfnt_off0000c778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8A 14380 bytes
SHA-256: 810aebe19246f5a27b3e66eaf43af36100b3b8d55214f0435d8135bc83a0212d

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