Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b870489713a3fbd…

MALICIOUS

PDF

83.0 KB Created: 2021-07-02 00:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fe78f98079933bf05713fd039aef17a1 SHA-1: 71595e27ce4b088abdf426254c1b0cdefad1d3e5 SHA-256: 9b870489713a3fbd55e42bb593e4c3c61157b37e731885e8c164e5bb0ac2eee0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. No scripts were extracted, but the presence of multiple external URIs and the overall heuristic profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://huntic.ru/uplcv?utm_term=how+to+combine+two+documents+in+pdf PDF link annotation
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/23e9b5932cdbed45a8aadd4a15715e32/79405428067.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/0dcc997087dbbe6a15c3bddfccb8c67b/perisugi.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/70170256489.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/48bab189aedc29a5fe56eda24c58d86c/69665570135.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/64984955027.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/sosisepidizewuxedupirese.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607875872db6f---mabowusumo.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/76286276759.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/s8bla46vgmrgtjj2p4jfj60nvb/jewodapodoxu.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/tiranafozikeribejar.pdfIn PDF document text
    • https://anfauglir.com/images/file/sixiwavegugavadagi.pdfIn PDF document text
    • http://ymmicro.com/files/files/73524338545.pdfIn PDF document text
    • https://blokhol.com/upload/files/toxaluzexetedoba.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089b2969aea6---pozawita.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c05f7558e41---38648548278.pdfIn PDF document text
    • https://dm288.com/slicice/file/73359904167.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/12647808550.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c1ef2419497391f179d99afe47125aeb/94424627436.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e1d5285e8219eae1a8429fcd4d2f020c/50745530846.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab950d2481---dokogat.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_off0000e1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 17092 bytes
SHA-256: ab4402669b0313ef6ff321f76d0d50178bdce1c87817ac642ddf174b86bc84db
font_01_sfnt_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12671 10788 bytes
SHA-256: bee8dc218a1dae211d3da33ec56b45b24d230040fd0f7846facdbcbbd8a5ea26

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