Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7e8fe556859574…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 18:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: daf36e098fce1daafb806e53c422ee92 SHA-1: 7b2842149ae3368582dffae6ee7d6a9880d5858b SHA-256: 7d7e8fe556859574c732834245769727948335a7c4c17b03ecd3f7dc5ffa86b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JS suggests an attempt to execute malicious code upon opening the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wheelmartthailand.com/image/upload/File/melerowubijobujeso.pdf In PDF document text
    • http://goldsunjsc.com/upload/files/bitoroduputud.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/77579445715.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/98723912717.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/notagesiluruxagi.pdfIn PDF document text
    • http://kim-clark.ru/files/file/28511947691.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/23083208131.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b9158be4cba35887aa5e6a60a6e693f/68854882578.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/3610254302.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/kezotet.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/69812624951.pdfIn PDF document text
    • https://akemi.ro/hirek/file/53492517000.pdfIn PDF document text
    • https://chineseclothingonline.com/File/56128249367.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/06a313544e92017f3d99c16ce8c68d1a/rifefidifotejukiximeb.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/dofenogogodazovafafuvegu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202192123084997.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/begetudofozafesive.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356d0ae185f---taferidawul.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/xojefi.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/57163239798.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/zawesilobizomafugegotoxi.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614094fddb890---49996223685.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/52475287646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hunger+games+2+full+movie+online+freePDF 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_off0000dae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 18580 bytes
SHA-256: 07f07db2f56a7fe4621a056de7696e2c5aca64cf663a9797cb2c92ad00e4074e
font_01_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 10736 bytes
SHA-256: dd6ac51ce78673fabb5206aeacb200aa6f4d4342e6d7402dd2154c1c109236d7
font_02_sfnt_off00012436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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