Malicious PDF — malware analysis report

Static analysis result for SHA-256 8206587bb6334fb6…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 18:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f8003d05c4fd204f51b6d78e65e4e6f SHA-1: fe7081316f183fd6eea5cfed6fdea9180d321d76 SHA-256: 8206587bb6334fb661c6468013d227cb77998da022769004bb721a61faa1fd13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a 'Pdf.Phishing.Trojan'. It contains numerous links to potentially compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a download button lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bpnv7lboiafr3l9u8csp9oto72/guvadetisesukofafewop.pdf In PDF document text
    • https://alkathirilaw.com/userfiles/files/11701399110.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161360b4596a8a---pusuwut.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/55392415623.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/65067080081.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/jijeke.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/zebetajubeme.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/rurosuwesawipuvo.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///31779642222.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/96174210772.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/dakatiwajim.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/worowidijanovunure.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/zomekoduzenizenif.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210904025606.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/wedujavajalo.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69034877960.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138a5110a123---72188285530.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/wowuxu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387c34d93b1---duwakujazozokelulaxapimet.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/rimusevimunuz.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/nabizikulakulu.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/5141916612.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/61907083564.pdfIn PDF document text
    • http://tochalco.com/uploads/files/gemibuxerijagerewofeta.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/87149166484.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/794ace33d93818eb53eda3991661c506/goxipupupupafenudefokofax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=oxford+dictionary+9th+edition+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_off0000cfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCD 10900 bytes
SHA-256: 1ed55633f8698a83378c4ec09ef1b257cec4cca1a81dbbfa9b04770b9ee16c0e
font_01_sfnt_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 17812 bytes
SHA-256: f75f48e0ed96dc2663d82ebad64307379f5ee2ad5b32dcb095e77e9919c3cb02
font_02_sfnt_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1