Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e3956597a78d39a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 06:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3896ab21dbe0d1b4a6e5e2b85e0e7cf9 SHA-1: 5c8c7ae61e52c4ad122dd8a1efe378267f9cdad9 SHA-256: 2e3956597a78d39ab3ae84b32a10f0205b4782258a507b4ec0d63dcb17bde5cb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://yongqingtech.com/d/files/wopolapasis.pdf In PDF document text
    • http://pkpneu.cz/userfiles/file/kesofifapewivigoposuduj.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/pejal.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/20931261380.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/77723800128.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d07e8542b3---jabasagokogukekunabofefos.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/48389592923.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a2a2ea2766b69abb94343f3182141d97/18580608425.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/56644786074.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/49495240351.pdfIn PDF document text
    • http://szpk.hu/_user/file/vasonod.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/55732648609.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/62432714146.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/18121270872.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16139b2195657b---18104603206.pdfIn PDF document text
    • http://moristas.com/userfiles/files/texixenuson.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/336373620.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/497973637614ae1dcca9e3.pdfIn PDF document text
    • https://gangnampools.com/contents/files/85517327409.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd1f19f9e2---55402443863.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/36687927337.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/gagojejemiwukugawagomalip.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/sovozodo.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/31017509201.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/16343186422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=atomic+radius+explanationPDF 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_off0000b3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDD 10860 bytes
SHA-256: 1b1945868ec7a9f5f59c173c65b0eb1e87268d2a2a9e84201da9d59d555b01ef
font_02_sfnt_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 17660 bytes
SHA-256: 2a4d886f4f2134500b22c549362a8c3902991c09baa90aa343bfb2d7672c2d80

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