Malicious PDF — malware analysis report

Static analysis result for SHA-256 6606659da45e7704…

MALICIOUS

PDF

88.0 KB Created: 2021-07-08 01:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 04c1809f4da25c022048a0d5f37d4305 SHA-1: 102a70424e6095132c629439d1ea5daba5c33650 SHA-256: 6606659da45e7704a0aa09973fb6001cbfb11b0751adabc8674ff8940a32b1d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded URLs align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://irlanc.ru/uplcv?utm_term=agfa+super+isolette+manual PDF link annotation
    • http://debeleven.net/UserFiles/File/2501466456.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/dipepaledixonajuluzefoguw.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9db72269e85c9c84f98fafd7da5efbb5/wimimavodesalokazu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2abe1d34---40188898296.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725a0677b16---38660979258.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd91f0effd4---jafupofopalivajujuv.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/59852265485.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/6354793340.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/gimokelakenuxagisuzutaj.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/50600910902.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b410448fe3d---funupila.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/mepodetojituwed.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085dd13d6348---96645087516.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/20786995303.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/6oimvfvr8lcs5vec8d072sa4gs/6139673225.pdfIn PDF document text
    • https://press-centr.com/images/file/90626083642.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/rawarogabus.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/fodoxavudiziji.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/baf79650d6c99283a699bb5332c33002/lokuga.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/gogoxipako.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/49215533053.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/67046531538.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_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 16740 bytes
SHA-256: d8bc228fa4e6d7a055246366b2a9342c300ba1a51981888c8c657df5b64abac2
font_01_sfnt_off000121c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C8 10780 bytes
SHA-256: fe5494e3508c2a07a77821f2fb33d50e2e39d468dc79d6c3e59b2e0799a72164
font_02_sfnt_off00013a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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