Malicious PDF — malware analysis report

Static analysis result for SHA-256 727adf95662a971a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 19:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b8a8ea3de34c309bd11fb51dcf110d7 SHA-1: 6197c41859df8eab78415175be266cdeac110736 SHA-256: 727adf95662a971ace0cbcd76918f0ec83dd9e537dd226624b3fefb27cca49b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://sun-green.be/ckfinder/userfiles/files/tutavux.pdf In PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/xatojopoj.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c3311985---59494227866.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630965575.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/sopuro.pdfIn PDF document text
    • https://sadex.pl/fck/file/65967339901.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/pakuwutenopeguv.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333635086ce---42462483994.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/vorizofijinumapabitulonit.pdfIn PDF document text
    • http://labsshop.com/d/files/pusogonifedepenajol.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/kojezejawoxo.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/ditepipitepapefok.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/30209326553.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/fegep.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/mowakulu.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///55299297877.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/damatogul.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/zijuwadatixuka.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/66313171632.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/zuxamux.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/fagoken.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/pikoxevaluzide.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/86332072758.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133952dbac02---25970052869.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/90358051128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=husband+wife+shayari+sadPDF 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_off0000d5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F9 10620 bytes
SHA-256: 020a0cb060d22ed8d778fb75da31a47c0f6f192d388d408fe14a52baaf638e91
font_01_sfnt_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10644 21392 bytes
SHA-256: ccea431f123b8ed8475e4adb97fd4f7c0c59b8fad68a67b931f1a080ce085c8b