Malicious PDF — malware analysis report

Static analysis result for SHA-256 453776b43ebd648f…

MALICIOUS

PDF

105.9 KB Created: 2021-06-09 15:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: bc548da64f9c8838ce88b95754977f41 SHA-1: 4dcf4f3429999a1bb0cf17a3cfcfa53afe487abf SHA-256: 453776b43ebd648f89ece4cab540d8766f1e6c822054e3a4e9ee4c6dd60ddec4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external URIs and is identified as a link farm, likely intended to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution tactics. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's part of a larger attack chain, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=the+best+th10+base PDF link annotation
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088f35431477---61399872566.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bed3e9743---zasarupoforikonodegum.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/82120725061.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a14ff40a874---jewel.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/232ee4c2273d5183c3adc8d4cc8412a4/zewumefozekurise.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607522ec79eeb---3648421034.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709ef341bb4---12362607844.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5d10ecbf8ee68977cab20e6f50339f11/dofinomavegivusolon.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b9ece29e7---73589835812.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5e2a9b4c---demotuz.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5aad5392---49345727597.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/31839481682.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4c8747764c317774b26d148a8454e778/tadobetapuxa.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/c5d2194cc838bb44c33b04759fa438b5/vawijezunep.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/20774fb450a465cab5e557b40ce85882/zuwofipet.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/593d66c8118656d51938ad4e649ef873/goxaxujel.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/lajeluren.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00014787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14787 4928 bytes
SHA-256: f9e30aeff6b7c0d660c83750cc0b6a05c3d5782cad0a43e1a42c715cb67df49a
font_01_sfnt_off00015849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15849 14852 bytes
SHA-256: b58401f929d91535cfb7ae9d28347a19ee38b45e2f8474517295c3977a169fe7
font_02_sfnt_off0001853c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1853C 16212 bytes
SHA-256: 6efb40b268911f72f267e7c519822e53a8eff306e9ccfbf8176a1cca38c35909

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