Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ce93c8f48375e5…

MALICIOUS

PDF

87.3 KB Created: 2021-09-03 15:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dfa41aca3c6012e89fcbd0f2a68686b2 SHA-1: 84f1583fce19537964ccf4f3203cde45fde98dd7 SHA-256: d7ce93c8f48375e5f15332f2b5d83c20865da6f3da8d8b358272a15dd8c7cb21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the URLs and the detection names suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://eskuvoiiranytu.hu/blog/file/gamajamusokebodagi.pdf In PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec6a7c7948---sijege.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/11076282271.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/157s1h5qjm3anbjnijb899m64a/51089869060.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160731a62e01d3---55985121137.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/17603180744.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/tivinekiruvof.pdfIn PDF document text
    • https://ebooksweb.net/files/file/60064895362.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd2249c337---rivowibunoxozajulonex.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/nm9p06emm0gag2t1d87vag140t/80014067129.pdfIn PDF document text
    • https://eetravel.net/file/82246805981.pdfIn PDF document text
    • http://ingore.cn/upload/files/womepanunaxomutufef.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160781897b96c5---vosalijivorot.pdfIn PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/nowutukiwotamigat.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/8gqq199emf9of0eqplka61lfe9/53612255447.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/p8p768bpuvkhb0pnhflevvg9b6/98133241812.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/bb9c76712d923368dcd80d732558a3ce/51226469427.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/22712054956.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d2fdad82bb3c8a6570e72f9fcb2f3ffa/52321965458.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fe21fb38d0b89711f072e7af907fdde4/nopebezusenowuladenokum.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610eb07a84b6a---82086748598.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/53657242317.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/93981a2045dc8b8f08038bca8ad3644d/69663938125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=enfermeria+en+la+unidad+de+cuidados+intensivos+neonatales+pdfPDF 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_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 10928 bytes
SHA-256: f4910234c25ff688c7716c3c662a423ea55e7ea052f38a84d6a2eac8875b33de
font_01_sfnt_off0001050b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050B 19428 bytes
SHA-256: 0d1668325a5c57a705258004ddca4f4e44b41b33452bbbce1aae6a6cb47b6675
font_02_sfnt_off000136cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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