Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5d1651dec96d82…

MALICIOUS

PDF

84.7 KB Created: 2021-07-27 11:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b7a62d1507331c2ed55f00faf0f386ee SHA-1: 0c50952589d79560a9a198b80300ee3efbebc38f SHA-256: 7d5d1651dec96d82506063899b32e1bb7ec9f1e4cc8bcf6f7105adf6e23e1ac1
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, specifically prompting the user to install a browser extension or update. The presence of numerous links to potentially compromised CMS upload storage and disposable hosting, coupled with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. While no scripts were directly extracted, the overall structure and heuristic firings suggest an attempt to exploit user trust for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a556c31f3d---48166342774.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/igt683fd8dq0tk9kq64qfnsvcb/39983753568.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/mosoxanefuditubovuxefe.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/zalute.pdfIn PDF document text
    • https://visualarchive.bg/files/43927781719.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/tonasamowafisoxa.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/anjksl7hi6o9qtittkuvnlgu5a/wozefuz.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d0dc79d4---serofuxavo.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/56067265494.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9c534d21fb38e678532166e7011bd758/41205566780.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/64491875323.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ec5487addc207661de95b422bd732cb4/79696226844.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1aa7101fb---wejudanujabig.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/64b9a603e63f38ad21867bc630c3b9a3/57865446088.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/2e0f16c22137e8c9d9c969db0538c21b/gaxaxixirutu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c1b61620065cd3c6203a245bc94df20f/dudori.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/8766df707b2f2db73ff88fc5557729eb/salelarawiwurukum.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/kesumesokugebipudopupilo.pdfIn PDF document text
    • https://noddy.nu/images/file/31231117412.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-12/20210512164753341519.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac5a2b251a---89028395681.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/53461445036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=diep.io+hack+game+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_off0000e6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 10840 bytes
SHA-256: ae57134a86ef29ebecbca69b243b9c3024557346a076182bdc0738f61b12d376
font_01_sfnt_off0000ff60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF60 16932 bytes
SHA-256: 6df1133d5a88f36647c02daad4a02f2faafc25d044dc69ff6621b192988758b5
font_02_sfnt_off00012bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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