Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd4bd4fac441e6e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 07:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ea4edbe72a9732b5f05484260e8acd1 SHA-1: fc8bbe12a94ee5ad8554660c3a00e3d9c76d2fec SHA-256: 4fd4bd4fac441e6e9049acfca351e4a391d08c5e8fb49ca35f3ebf77946f25da
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest an attempt to lure users into clicking through to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://asmitahrgroup.com/ckfinder/userfiles/files/namawugadanalilaxo.pdf In PDF document text
    • https://cs168.tw/upfiles/editor/files/xuvokig.pdfIn PDF document text
    • http://aurora-c.jp/files/files/56954247571.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///bijerapujagixerujirelif.pdfIn PDF document text
    • http://generoussecurity.com/uploads/97117106148.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2a59577a21741ebde1e402a5e18fdce6/jinanokiba.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/vosejibuxasakokuvopegudi.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/karojukezilinojuke.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/tudakivamobujirutotugopej.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/54951848996.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210912222519_1807700642.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/73407431734.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/pazozezexafiminofa.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/79738828274.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vhgb39libd8rb1a82ptih247s4/jumizoxaluxokasikitogorek.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c1fee19d---25813308044.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0f902b40869da98b3360ee49be77352c/tazugi.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/javaxiv.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/xoririnexirewafovele.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/9757947356.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/68241757551.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/begoxetovabapone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=among+us+download+windows+gratisPDF 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_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 10628 bytes
SHA-256: 047af46790dc809f26410b738932a22ef9d52d24b80e0d7a578b6223b9928aac
font_01_sfnt_off0000f65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 16520 bytes
SHA-256: 958e2d3652c630ec5d85d33f69047a3d53d44efac6a98e66dc57c11ddecc0562

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