Malicious PDF — malware analysis report

Static analysis result for SHA-256 3222570567881299…

MALICIOUS

PDF

83.9 KB Created: 2021-08-15 11:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b9f60a307c04b4d0768bbc724745ca1f SHA-1: 2c854654eaa0f78d2b6af176e0e322a0af32583e SHA-256: 3222570567881299cc38d636d491a161a1acafa0fa01051dc88e50aecccdbb04
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads 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 malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://queure.ru/uplcv?utm_term=ordenar+oraciones+en+ingl%C3%A9s+que+estan+desordenadas+online PDF link annotation
    • http://ahxxzx.com/userfiles/202105/file/fudavasobekitokejeneja.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/pasesemijowovej.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/45887628711.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/vujipodo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a905836e4---puworogoxorigiraxipalux.pdfIn PDF document text
    • http://guowangcable.com/d/files/48338906190.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c59e060965e---wadubotiparukanetel.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/1408295279.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/73349812332.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e0b704ac---67275463636.pdfIn PDF document text
    • http://signauction.net/userfiles/file/8482030233.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc20e16447---40776048644.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/59049927949.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/wumibu.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/pibizixovukokegonel.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/29252a327f20264fd9956480291e5fb8/radelusak.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/8furjj4o0d3e87h8rn02p8gab7/lunuxilexededamikazejiv.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e6bfa6ea32---zofidawolomedugilujas.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/vomosolatububizisuvok.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/22648588345.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/xovexa.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/53897600204.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/53424452247.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/sewujan.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/vexeziguburog.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_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 17012 bytes
SHA-256: 1b409f44c80586a0706106c70493f0d33e0f7e755b4dd4245e60b45995cd1109
font_01_sfnt_off00010d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 10972 bytes
SHA-256: 5eb775434b1b42e5e4e3a5d04f9d950b331eaf27b44333a492d4f22026c982e6
font_02_sfnt_off000125c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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