Malicious PDF — malware analysis report

Static analysis result for SHA-256 94bff428eea252f7…

MALICIOUS

PDF

87.8 KB Created: 2021-09-02 02:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4bc4fe97c6446369a4ed4280b63c259d SHA-1: f76bf38e908ab326b07ae28faaacea562108cc8d SHA-256: 94bff428eea252f7da9c4ef02fe3288700b39a67107cb2b514fbef7c53bff9a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics suggest the PDF is designed to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://digifast.cz/userfiles/jeturekizizi.pdf In PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094137cd5e41---46718517834.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/kowizabubalano.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/92ca6242e424d80f8323a8d725b5aee6/mexafatowekukif.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/r0au8bj44f0r7e51kl12juefno/tebigipupelinuv.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160720b77bb832---pimufajevamiravi.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/bugexirejami.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021043001480319.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/18881372847.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c405b97a2eb---fuvazanozagesov.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/mapidowixuvodubox.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/955445ef9e385d018c39c05737771d32/zegerubi.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafcb15b64---zijeje.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/gabukolegu.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/71322322443.pdfIn PDF document text
    • http://toyotalongbien.org/data/dulieu/files/mufut.pdfIn PDF document text
    • https://bselink.com/userfiles/file/46423187489.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7742bd4bab---denerekajodilosorufilobap.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/a0f6f49db7ed4d072c3276c908641c66/sidelifetepikegutijasug.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/jijisujalexotogumubefip.pdfIn PDF document text
    • https://mkart.it/uploads/file/kigimalalikewososim.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/38782665964.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/14521903551.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5ab45614fad364ce21de9053856f30be/manolidoxetojezogivirose.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/dokofuzifelupowasesop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+open+ps4+disc+trayPDF 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_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001095e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 10728 bytes
SHA-256: dd7ed54ec423bbbd6d68801b19051bd611bf3a2b3f601811b908152fe9689e9c
font_02_sfnt_off0001223d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223D 17828 bytes
SHA-256: c152ec325159dd785723dcb7066c3079665fc9e780178068e3ba1719f8f14b20