Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb34d9964dc1fea1…

MALICIOUS

PDF

85.4 KB Created: 2021-08-15 01:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d1a4083183f1eccb0efb93f6cfbcc06 SHA-1: 99c5b59a7b46558abd9e5f547f86b1e31dc8efc8 SHA-256: eb34d9964dc1fea1814572f5d143e390b91f25f571fb1719fe44084016b96765
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities. The file's structure and the presence of these links suggest it is designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc58fd2f4d---mupik.pdf In PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16118148b92b9c---dugixutexupovazuxamavaz.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/50703535780.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/95730003893.pdfIn PDF document text
    • https://kermanrooz.com/img/files/79667723343.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaa121040d---67083458903.pdfIn PDF document text
    • https://medtek.vn/storage/file/51973377020.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087e2e2a96be---sogokakesevunutesuresev.pdfIn PDF document text
    • https://people11people.gr/uploads/File/56671577167.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/33657457070.pdfIn PDF document text
    • http://1careglobal.com/upload/files/nilemus.pdfIn PDF document text
    • http://houselandia.ru/files/61707973982.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/0qt08t39k357u9lf40jv680ni7/8889559365.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/kq9pvdq63h5ddbbr762mklsdef/fipamopilakuwosirovumupo.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f3e8af747---pibuteteta.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/afceeaa32bfa39fe0b7c98b41de3481e/67095222214.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/notojexut.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabbf7bf130---jovuperasoxuvubib.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/fazunax.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210530042448.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/98002218816.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/gedodajijuwizikuvuvologam.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/10326512216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=informacion+del+coliseo+romano+para+ni%C3%B1osPDF 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_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 10840 bytes
SHA-256: 2bbdde8332964d8a155f8d51772e6f0f1e6879ef24f8fc19b3aaecd6427a2fe0
font_01_sfnt_off000100df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 17504 bytes
SHA-256: 0df293628237c85eca532d69df36c069b9a1ecf84157299f3fa65aeb6a4d3bde