Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc040214abd49dfb…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 11:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 60f09e4532327ff61fc3c342bd72e337 SHA-1: 53effff1a702942c2a8bca72f493e8b008c30e28 SHA-256: bc040214abd49dfbabb99bc8c1414b594daf2a5d9ba7d3dc2766612fa3eee1c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://catamma.ru/uplcv?utm_term=ejercicios+de+ingles+zero+conditional+pdf PDF link annotation
    • http://www.firengo.com/userfiles/files/rokenijupisidaxozadoxu.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/jamojasaravet.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/69205080908.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/pakopuw.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/bozojunukofifub.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/tufaxigo.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782c646af0b---muziximegedegunabew.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/34404496844.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/7474455fc1423b3326748dbe17c93f9b/5345225721.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/26894771763.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16073ce4d53756---47185740215.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/zaxupezame.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210722_29C35258DFE26074.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088d4ccd0142---nomowetulurukaxina.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/jusumiwozalased.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd344d02b7---gofonol.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/51860384553.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ce3eb5f1---40978707051.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/19176971258.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c48f77df4c2dc787a11e401f5e0a5588/mesutuvuxurunuw.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/336kjo8rokj4fr41o4mb7p1nv1/dikenorenulivotulogaj.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_off0000dcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 10968 bytes
SHA-256: b20033b933ea3e0be06d9490b9de4e2a621adf5b88d7f8123a2a3262d25835c7
font_01_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 19296 bytes
SHA-256: 79d921e1da399100134afe0d9aa7b171270471cbe56441d1eee7324f3c7b7a81
font_02_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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