Malicious PDF — malware analysis report

Static analysis result for SHA-256 add5c307a751cc58…

MALICIOUS

PDF

70.3 KB Created: 2021-09-12 03:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7ee9c867c77b8beffa92d0019e0f0d8 SHA-1: 782f3e25cbb3f08f751aa74608a2fe9ce2a19e08 SHA-256: add5c307a751cc58c90e191b5a01aa28eed47aa22583d9c5f39f019bbe05f30a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=jesus+malayalam+album+songs+mp3+free+download PDF link annotation
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/15438945520.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/nudekiratasetebek.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/zozaga.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/nugosiguwivepeluguko.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ff2d46f03---xizirokaxot.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/10688605510.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/8378847864.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/31789608268.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/87711692127.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/foxas.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/dupalerigekinokitexirobu.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/tafekabogutone.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161341a6311a35---lakotufaneba.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/77708640684.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/48a19f4e25795292fe4c62b935147e29/doliwaminuvinedugufolaza.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/pezesemezivisidako.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/taremoxa.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337b5f427be---seruwekemumu.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/rigewesariloruwusifidel.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/36209045461337f4ccf96e.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161323a8bac358---vakewanuzimizofupatuk.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/70888043358.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_off0000b1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 15572 bytes
SHA-256: 177c15da0b2dc4baa5ffd70e4d9ea3f9babb44e5b348740015ba920f5ee4a99d
font_02_sfnt_off0000f1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 11256 bytes
SHA-256: 839a0cf7ec2bc084f0a635e98655e1cb20bc56db33146812139be7dbd8d4f8b7

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