Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe709639fe240b1…

MALICIOUS

PDF

71.4 KB Created: 2021-09-09 12:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4892f6dcbe2d1992cc4861c9460f744 SHA-1: 9c595e0d8eee9245007dbbbe16e6dc94034293a5 SHA-256: fbe709639fe240b138487acaea3c8af1e4c8cb81dde465b7a5fe7e8145bc34e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to lure users into downloading further malware or submitting sensitive information. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=imovie+app+download+for+android', suggest a phishing pretext related to app downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=imovie+app+download+for+android PDF link annotation
    • http://delfosventures.com/userfiles/files/47124856089.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/72612738620.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/97136557246.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/dekusapavevazexisirug.pdfIn PDF document text
    • https://reha.bg/content/upload/file/46715619448.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/19926656633.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/94404812305.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/zumoxugaruzajazivuxat.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/gimegijawemafilaponod.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/remojuxet.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/supimogenod.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090913314722345.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ce0cfad5e87f04ec676490ef23578db8/pudejuxudog.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/e9b1c39cc6241dcae2efbd70558d700d/17514198442.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/222e2e904d88d80c1bdb0c9cc9b1ae7b/sazekitizodawemoreziko.pdfIn PDF document text
    • https://invision.buzyhub.com/files/mupukugovoredom.pdfIn PDF document text
    • https://tempegaring.com/contents/files/53049046985.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/95545237787.pdfIn PDF document text
    • https://ultralloy.net/upload/files/rerezojexilafibaru.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/dulilizoropemosi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/33935185117.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/lejedosurexuredopatu.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/47618210252.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_off0000b65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65E 10496 bytes
SHA-256: 8db7625121f08737aebee412ca6a8dc5a3812627325de499c2dcece590148d6a
font_01_sfnt_off0000ce2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2E 16472 bytes
SHA-256: 69a140b8d4f82095b7ef69c3a7b0d71987e0350b7a968afd863f0814284ebea3
font_02_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1