Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6c3d82ffa73524…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 11:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4757808a24d486898164db4fe88037ea SHA-1: 7997e87c755856543219540b86d2556aa299b0a6 SHA-256: ff6c3d82ffa73524904cef92ef47289ae73284e5416e9e02c6abbd0fa95f4e45
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious or phishing content. No scripts were extracted, and the document body was unreadable, but the presence of numerous external URIs and the specific heuristic firings strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://novosib-sport.ru/ckfinder/userfiles/files/57567823349.pdf In PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/91028824029.pdfIn PDF document text
    • https://eniedu.com/data/file/20210903130751.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/20274628465.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021921148227898.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210912_60D004679DC31CD5.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac013130e7---78752073843.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43378879486.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/jeruzinekubikodoraxurebog.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/22a21122eb9ac99206ed48977227b616/2620161025.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/91184073709.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/kuvixizakiludul.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/wejexumagoxaget.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/67495601945.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/rimerunegadirefisirixeb.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/67587538467.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/87770743176.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/wiledesemomowiduvarazawuz.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e258b68d4c---99015617727.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/pinemomipenijizekafaw.pdfIn PDF document text
    • http://scro.ru/pic/file/gisugukigujuxavutob.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/xusinurukawesefawazodek.pdfIn PDF document text
    • http://santehnika34.ru/images/file/guvawopuxoxuz.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/88557954110.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143a062a308b---8319674185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sonic+rivals+2+apkPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/lirajobusiwub.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_off0000bc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2F 16648 bytes
SHA-256: 586765925069726d5967a345cb0f723a29a5310f289e5e044214801dd1e51832
font_01_sfnt_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 10488 bytes
SHA-256: b4bf0207b9a1727fa35fc4eb70d4ee31f6cda88e456db1a13bcb121744a94754
font_02_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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