Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9248f2968295cc1…

MALICIOUS

PDF

73.3 KB Created: 2021-07-17 05:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f1ee1009a06f552b7315b3989d2765f8 SHA-1: dd544c903a1ca0069067a57d30c060b7c05db491 SHA-256: e9248f2968295cc14f3a8f93ec23558e9958053851f3ac09b592a6cff51910f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. Heuristics reveal it functions as a link farm, with many links pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of multiple unknown URLs hosted on various domains supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23e63f2cae---kudebek.pdf In PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/1d3380dbd9f928ab11318e5ae3cd2b55/70593600044.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/rowipodifekujewefevow.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210430054157127.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/38521950126.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/fvre5np3v1v4jj7j42nl9ilji9/kekemokavenojumogunisasu.pdfIn PDF document text
    • https://spacio.hk/attachment/file/sodukozoxokugosawaneda.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/telewijasilobum.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e5c3f383a0e6a3c94666160a5d1ce358/nitewegejudulisux.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/fewinibepeduvuta.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ad56ed186---75007487272.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/volalibakag.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/46900045052.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/nixusatogakigarofalodari.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nowupiburuvinogidiripi.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6818e2476833585f24cf1ca5b490b9e9/30956366595.pdfIn PDF document text
    • http://xenangheli.vn/public/files/52664889761.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/6189110350.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/99627436876.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb0de7be0---11934876773.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021051719511956.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/68974944162.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d770e73c7b1bd875ec601217733a6e58/91984613677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=christina+perri+only+human+mp3+downloadPDF 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_off0000bad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EA 11160 bytes
SHA-256: fe30bd7c7999f8b366c19cc1197f51103b4266a41c2bd55219bb5b69df28ebc9
font_02_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 17108 bytes
SHA-256: ca0ab2f4d60b77ee50844380a49bc6a1ae20212288823feb75db8b27680313f6