Malicious PDF — malware analysis report

Static analysis result for SHA-256 f855a010ca98cec7…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 05:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 00a9c5ffedd0b86085303458d04903d4 SHA-1: d74705cdca2026f1f3b93113511519cd27dad157 SHA-256: f855a010ca98cec789d7ed8963f3f38387e5293633e7396c005ff974b86ffcc6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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=how+to+make+lock+screen+live+wallpaper PDF link annotation
    • http://erh-hu.com/userfiles/file/67613397149.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/ledakisiruj.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/44929081059.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/kiwopolubuleguvamixag.pdfIn PDF document text
    • http://ned.ru/uploads/files/6100707552.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/95104976515.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/8673303652.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/sopavuka.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/numepakukukibowip.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/sulovubadonomelusotefov.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/8sm916a4tdtdbh1m3l13gi09a4/jexonoserobites.pdfIn PDF document text
    • https://aedwea.com/upload/foto/fizudola.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210919074354.pdfIn PDF document text
    • http://freeorden.com/media/file/tubegilixesel.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/lepuvilovubogepo.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/fizonenizi.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/jomoxijiposisosere.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138e84e4d8c0---bozividin.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/fikusikanijeful.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/306405693.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109191803025252.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/jirunaxiz.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/62560526688.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143af6bf11d1---rumabapovivefefafuxume.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_off0000cf20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 10772 bytes
SHA-256: 2550d21fbd7c53a05be876933f0db7e158e18df558d20dad47413517c48c8b72
font_02_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 18376 bytes
SHA-256: c04a3e817ce2bf69bd3e7252ceefc829b3219643318e514d4674162adba2400c

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