Malicious PDF — malware analysis report

Static analysis result for SHA-256 717f176db5fb59ca…

MALICIOUS

PDF

73.1 KB Created: 2021-09-03 07:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e2a4ee9b49d16d1a4cd6afa4390c385 SHA-1: 45bc9b4d774593a5ed0e12d840f55fdd6bf2525d SHA-256: 717f176db5fb59ca0ebda672a26b727ed53b1a63b5b9b02cb8bddfd9dcdf31c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://3bbb.fr/ckeditor/upload/files/sepotubum.pdf In PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312c3b39dbc---ditawoxuzifep.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a96f197ea7---vavatipexad.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/21176428958.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/zipixukadagosuna.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/2696841216.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/18634866224.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/gebisupubulekidukon.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0041cc3a0---zabudobosuxuzudakeb.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/62126081423.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/213ddef042817385a43686d5336f4f2f/70433379893.pdfIn PDF document text
    • http://plncse.hu/php_data/file/72174437689.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54e19e466---nunurapomu.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/21237227918.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/67999166306.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/domosulikazulizabeke.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/17884142872.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab69e771c40---vazilugetuxuwikudasosed.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/67427990906.pdfIn PDF document text
    • http://ccshecea.org/upload/files/79054762641.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d3538fbeba27fc40b3efaf89fb1ecb25/fogepegojodujepabadog.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/64271027828.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fffebacd1---veganojotigopixefana.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160844943b8f2c---28095378906.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/gezafiniridexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=adolescence+psychology+pdfPDF 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_off0000be65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE65 10540 bytes
SHA-256: f65bbe552ee6de3970d818bf1e3cb391483802ff036c347f1fb084b8ade5bf85
font_01_sfnt_off0000d627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD627 15808 bytes
SHA-256: e7b7f7b827ae4a1db9f0aacaf8ddac4522392986162d859340e2d817fba04d25
font_02_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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