Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8af4b236387b86…

MALICIOUS

PDF

78.5 KB Created: 2021-07-05 07:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 719f6b4c4bf08360492786c6a9ac6f40 SHA-1: e1bf4b371687e0c52b9939c71bd808f735e96417 SHA-256: 4f8af4b236387b863003d8a59daf8fac7907b1148bccce41e234a391433e00a9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the link farm pattern is a common lure for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=pedigree+analysis+questions PDF link annotation
    • https://cowichanseniors.ca/userfiles/file/67134792029.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/18/file/20210518_004937_200.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075708d14610---nelokup.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/d5e2c423eaa855f7b0d80f6e1fc0f3ce/10187197421.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/16610421536.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/43450561340.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/nabovufirobo.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095e0842ef4f---nuneludu.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/92080306047.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/72909536543.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/xubunozasuweg.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/disalekibefemijeviwidajas.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/89628473880.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/95886396518.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f2f8d794---pudanemelukejadenekig.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/m17bu400qlbtqvut68ccp680ch/73289129788.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/14900488754.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cb24cafde---fapewatugosetilofibabelo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/pjlf3nct8ht078tv8agtb05qeq/13713383930.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/5066fdd33728a16ac657c88538854095/suzomajojuxol.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/xigus.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/rijosevalodemosux.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099226bed746---33923541635.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_off0000cf90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF90 17132 bytes
SHA-256: ee20154f6040a3e8e3eb65a10e419d89018d95ba1c398fc45c8edf8fb4f7243f
font_01_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 10784 bytes
SHA-256: 22cb369e1f43a6832d04191b70a1a9e63410ca61de797c6ba3b1d1f760fae1f7
font_02_sfnt_off00011489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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