Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c34d61af349bfeb…

MALICIOUS

PDF

88.0 KB Created: 2021-06-30 03:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f9261a486f49b23088d064ab92c6b183 SHA-1: 4f013d7ec701316c72b1a04460cd64792e7a3a55 SHA-256: 6c34d61af349bfeb183419268ac76b4b876b66612098bfc62d4850576423b8b5
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 it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://jaiminsales.com/ckfinder/userfiles/files/jaregonomab.pdf In PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c60bcbbfd---sopasudevila.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160860100619ef---jetuwobanipodabuxalo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16086af3966569---67151875472.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/95488145843.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/eb8c635c1bb13c20dceed58825d70c91/valapidofej.pdfIn PDF document text
    • https://olterus.com/contents//files/dulukubamepatatekozak.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/6lnn79hafet0d803npkgcufali/22229814731.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/venuzezadexumufofu.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/dulox.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/968jupcuk2hfi1aio7v7kofed0/doliruxine.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/70930009371.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/93491190415.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc130386c---69443641310.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/67264981691.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b23278b3250---giwebej.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/vumobuxajefoxusigot.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/f2b6905a7411105c9acee12481fd68b9/90768575891.pdfIn PDF document text
    • http://446888.top/userfiles/file/98812288608.pdfIn PDF document text
    • https://afayl.com/userfiles/file/453077593.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16be6185f---40715686014.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/kofodib.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/buroxizisegovisikulabagan.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/pibokugifimidipexoge.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160946bc6349ec---6500214300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=high+school+love+on+theme+song+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_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 17300 bytes
SHA-256: 1d5674c4ab17fcf94d91adb8e583a345b7e94b35121383befc89af9e6af9a165
font_01_sfnt_off00012091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12091 11176 bytes
SHA-256: 45bb72629ee8e18fb8d40b80623b2f8180ccec2b7197de325c51dcee17fc9b7c
font_02_sfnt_off00013a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1