Malicious PDF — malware analysis report

Static analysis result for SHA-256 261f54ef22b66a65…

MALICIOUS

PDF

88.1 KB Created: 2021-09-19 00:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1ff09aa4c22472e8a3a49349371441c SHA-1: c1ce6705d5d7ecb2a2810330131eb372749942c2 SHA-256: 261f54ef22b66a65935a58a0a962b2f87faf1971407e0d3d2ace95fe9daba238
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable domains, suggesting a phishing or SEO manipulation campaign. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=best+android+emulator+for+android+studio PDF link annotation
    • http://tupnate.com/ckfinder/userfiles/files/24717857620.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/melulujexozidalumofanog.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/ragelis.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/sipixonetugemevaroboxedon.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f3dbbe7f7---24599390954.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea0e71a1a8---34088361402.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/99612737058.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/vebetonolox.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/mudikupomifolududakopi.pdfIn PDF document text
    • https://partnermind.cz/images/files/tuvudugevarekazanire.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/5597794478.pdfIn PDF document text
    • http://szjg.hu/images/file/12385433175.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/kutudijaxanimupilab.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613581417f973---34828128137.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/41941399641.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109111100212728.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/11163577522.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/n2ja6s96ebi8pu83ld2ndrmvfb/wegekupu.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/dujotepuvo.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/weragepajemuviziliritotad.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/moxuwonisowix.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/mifufoguzowuvakubija.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109151307101252.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161373e2d264c1---89843181852.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_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 10668 bytes
SHA-256: a267b412e24c3d4824b83de405d2f58266b8b35ae6cc360463f311a3f565575f
font_01_sfnt_off00010d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 17536 bytes
SHA-256: fd540ec5da0f31eadfe45820dc2678e46f7cb63a06583a3bab28c051fcf41d8d

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