Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1f3a979799657c…

MALICIOUS

PDF

97.4 KB Created: 2021-09-07 07:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db1d0f8e1a34bd471971f1e79248d598 SHA-1: d654e04a450c8ee0882ea893c16ca79c6968e6cb SHA-256: eb1f3a979799657cdb4b05e2e30a2d6fbd001376d01c667f5ac99ecf1c2e1f3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised websites, likely intended to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://drafthe.ru/uplcv?utm_term=the+pigman+pdf PDF link annotation
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/g01og19lbpfvu9vj8eqjfpk9mb/wugetuxoleximepakadaxus.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/sagajebumogode.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/setuzipexisawanu.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/175c831d3ea900b75585130aeeb5f7c3/jazetavojatavu.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/minafepuparativud.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/pijuwulinujemubodiba.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/lugalukusuzen.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc6b281529---47498279440.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607192aaac792---91049175132.pdfIn PDF document text
    • http://vinmexindia.com/uploads/tatakovazitowexafabexaru.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202108100051394576.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/d0fd55dca54f1a3a05c972c617241352/dovuzosokonubunoro.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/xofowakow.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5124d49f6---nalojom.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02aec5e7aa---fegeminifizotidid.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuwidetimovakazapisamosus.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/30708018443.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/mumamebupemim.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/85844301552.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/cb76701de64d648f742094f4ba6133f3/jegukozuzokusetofowit.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/ribazubigenatawojilizufew.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/62255542338.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e239d6a83---piwovatefalolemos.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_off00011793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11793 10376 bytes
SHA-256: fca5711a8dfb724868cef692c1db5d553ee4979c342f8582720166c80dc46f3a
font_01_sfnt_off00012e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8F 18948 bytes
SHA-256: 630ff6187c795b4fdaa3e80d84e81db2ddc687d62f05b3bf1dd26741c2144cdc
font_02_sfnt_off00015fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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