Malicious PDF — malware analysis report

Static analysis result for SHA-256 108167d1636f8a9f…

MALICIOUS

PDF

76.4 KB Created: 2021-09-19 21:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3dccd5af9d86c812e366a517e43fa7a SHA-1: 9d0d3e3ae61ebaeac5e841d6168ea637a41ffcd5 SHA-256: 108167d1636f8a9fda2627dfb826aeda3b15fd66761e85316e021ff48085380c
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous URLs, many hosted on disposable domains or compromised CMS uploads, strongly suggests a phishing or malware distribution campaign.

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://tsraccountants.nl/mailing/images/photo/file/vitipudimiri.pdf In PDF document text
    • http://coming-c.com/userfiles/file/57393474721.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/59066611738.pdfIn PDF document text
    • https://lapakunited.com/contents/files/rimaxurenaveresoxuro.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/61889033724.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/93976399783.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/15444594561.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b7b96bc727f6e18ba395ba5b4847efab/renanaxudem.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/pinikafegugofuzigiwowo.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/66188485556.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4dac45a41---46905993952.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/47542422549.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/jowebadiseborefetinev.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139377e56d74---sifijonabugu.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/tideminedeta.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/73989266431.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/4a320f2d14f55535fec8da1087a0fd1c/viwiwimopiso.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/menejivi.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/8326266401.pdfIn PDF document text
    • http://edeins.com/userfiles/file/80919182459.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/fuzewuse.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/11433287703.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/49491661390.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/witagafor.pdfIn PDF document text
    • https://viceda.com/userfiles/file/rilivenotukodaviv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+windows+emulator+for+androidPDF 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_off0000c626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 10752 bytes
SHA-256: e003dab536a9e8db80015d65b97be966b09a1c5659151440fc0cc1eb3925fafc
font_02_sfnt_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 17216 bytes
SHA-256: 45c269ab32bef1b1d7255396eded76d73191c673664eb0f8ce92b828c621973a

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