Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b7416e7470a5c6…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 21:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bed86489918df19bcf16e3c6dd272e9c SHA-1: fe4cd2bd2da1c643a9fe440ad1252d4e50212a65 SHA-256: b9b7416e7470a5c665048889402f4043717297a8c02801b0d7dbd2a60a57eff3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. It functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of numerous suspicious URLs points to a high likelihood of malicious intent.

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 http://volareinmongolfiera.it/userfiles/files/tefov.pdf In PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/9d8tcmimi6id2i69dn0aiufum3/noberivevatibudigezoreru.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/7oapi35v2oitml0v6718f6nnat/dawipulewisomalu.pdfIn PDF document text
    • https://schmitz.cz/res/file/vurewukugotusa.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a53006501f9---97709516756.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/wodekojupogusubi.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/telexigedosidobadebizil.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/9bb5671b6e98d79c2d39dbccf3328f67/89625409564.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/461f35b882598ff4a8c617faca5bcde8/69617586140.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0ef2cd91---kubusero.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/pupasajoj.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/43982057892.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ap12alprele11lelklgtc4lvi5/89213621049.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/zadoriranipogud.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/masanuze.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8c29d95bcc95b0fba7bcdc36cfa04157/78496246659.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/45798914155.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160775e83968d0---lupomiwagazopijewikoki.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/90bff947b00b9ef7b82c65125da696e0/wimizefamap.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e757edef5---jugeze.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/916f1f07123484b389fa2c060ca65ae9/kemupawinufelotu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ce9b076dd---lopajegaxaxukopexuva.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/mumegifobeles.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160973d2a65274---6847276455.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/35724182875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=discuss+the+history+of+computers+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_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 10788 bytes
SHA-256: 1ca73d9d22839c2c4dddc28469470c7162d9aae2e6d9342ed253ef2e0eba58a9
font_02_sfnt_off00011e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 17080 bytes
SHA-256: 9ac73d87b266b24a7c4e17cac274c1b84f966af23b85551d1ab64001cd13b90d

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