Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6eb35c4470d219…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 00:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f1436bee48152a4e813ba43fcb29d371 SHA-1: bb7ff190f9e4a699db5b2c3bdafdaa6f99aa1a41 SHA-256: 5b6eb35c4470d21942f6af27a9b060cc7135195c640ca709ba27d4e32ae060cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or perform malicious actions within the document viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://monthclean.com/uploads/files/202109051728328918.pdf In PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/47628544317.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2919f1de6d---81529028399.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/bafilewujitaros.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/rigokozi.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/21759218936.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/63347318348.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/46075648941.pdfIn PDF document text
    • http://honda-vo.com/upload/file/18627774850.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/gusolivanitidujomebive.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609107748eee5---vadosifekemadavonatoboji.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160930690dcd45---28314869571.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087da159bcd1---ratifenukelu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/3167149679.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb8624776e---60388622479.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609207fc8f7ec---wosoxev.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-27/20210527170345492031.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/62530479792.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/734afaf945b47ba6e8bd6b3ce4716f1a/begiduxemuvasedegadi.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/68528259272.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/01115f2eebbd36cbedc19faeb2fbb251/somibulazujawobusenu.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/dazesivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bft+cds+manualPDF 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_off0000d314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD314 20192 bytes
SHA-256: 2a2584547fb5bebea0a162883e05a81f86de948ee385bd53919de9e42a8fca84
font_01_sfnt_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 10344 bytes
SHA-256: a797495823059f148e59d2e8f3dbe2df646aecfa879f55cd52913a0dde774d12
font_02_sfnt_off00011f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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