Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a741b6866b7506…

MALICIOUS

PDF

73.7 KB Created: 2021-09-17 21:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a995dd35caf956c1001b47a5038d1bf SHA-1: 23113d66fc8a36046e6baed9a2be3d12cef69747 SHA-256: e0a741b6866b7506e3c9a3bd3bd4c80277eb5cb5f5d38426d5b23887c5285404
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a link to a compromised WordPress upload storage further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://grandviewcommunity.com/userimages/1161671004.pdf In PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/lowoxesube.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/kelubaxuxudufuzasubopo.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/nupunonebogogafiwizanadux.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/73136513971.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/jinuronegobibudumasor.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/talariwelega.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/sarokawirikulezixew.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/68727529380.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210914092804.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/pepadogitipivexibisomerir.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/3abcadf71b9255d4996384bf55d5c49f/43236864024.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/wigadugotaraziburo.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d165de7bcd011b86734975a49101777e/mirilazaruwifut.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/tebezisudowufanezuvozasid.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/41190439780.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/45802419967.pdfIn PDF document text
    • http://master-vin.ru/files/file/7484404231.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/51512067233.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329d4e3d2bf---94147804730.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/57207639268.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/junimebuzu.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-02-15-19-30-24.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=euro+truck+evolution+mod+apk+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_off0000be3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3F 16452 bytes
SHA-256: e39f6aa0ecc40ff92b0c014f8197c353fca28e1643929cf4827c639d6c7b471a
font_01_sfnt_off0000e87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 10832 bytes
SHA-256: ccca907a261d281557ba105d4ed60fa16d44ce715900b241ecef0194f089f5a4
font_02_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1