Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea5fc455e86758f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 13:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2eacdf247c34aa4e90b7dc518f2ee4ac SHA-1: b819d0b2e171a0dfddcb4bf5b308322bddf981fb SHA-256: 8ea5fc455e86758ffced1bb5409baa6adee6a9ace38a10f8a66abd2051b39fef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many hosted on compromised websites or disposable domains, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sbsinternationalschool.org/userfiles/file/xegevosapanenosemaxoz.pdf In PDF document text
    • http://findusafranchise.com/files/files/16150741884.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d705e8a3---37952961568.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/faliwoxeful.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377b8af17eb---meviburixogawot.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/kazirigibeja.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/sikusawudezavesamusel.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161387e0223b6e---lelut.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/navafifajure.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/3311febede94875a83dacf57483ace4f/14172264848.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53228190927.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/23565856318.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/69305409803.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/buxagiwi.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/90555272478.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/73569840838.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/72731576751.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/diruribamivalizib.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/80041494874.pdfIn PDF document text
    • http://czminghe.com/upload/files/82268270580.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/89587795597.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3e4d9d02f---30557459086.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/64762425110.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/81810489413.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/mosilekorufubexep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=roblox+hack+unlimited+robux+2021PDF 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_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 16944 bytes
SHA-256: 711d0a321266d9d8007cf05a023f2c9f157604e61005e72282d71eef4564694e
font_01_sfnt_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB8 11240 bytes
SHA-256: d0930c73a2bbaa988ea905aef0673465af68db82d65dae51e4218ff217468bfc

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