Malicious PDF — malware analysis report

Static analysis result for SHA-256 c226894fd2979e07…

MALICIOUS

PDF

77.0 KB Created: 2021-09-19 20:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d85df6b0192e7dbbd667a98e9994650 SHA-1: 53260c8b298747fdb82edba4fd49cc63a68a61ee SHA-256: c226894fd2979e07fd67bb8c3fee55ad61d6f9234b7d1902eb53bd6a28fcda4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studiopol.com/userfiles/files/befiwena.pdf In PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/2320426259.pdfIn PDF document text
    • http://emeat.ru/var/files/79824065012.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/56934566173.pdfIn PDF document text
    • http://df-2.de/images/daten/file/36551606746.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134eb3476244---vezegimebavuxi.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/wuditefonud.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/28730341894.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144b784acfae---23961000643.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/dilaveresifuwabawed.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/92697104423.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/26200486349.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/kezonozulusulurofiv.pdfIn PDF document text
    • http://na3.it/misc/file/49548572859.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/52316866963.pdfIn PDF document text
    • http://schokofontaenen.de/idata/81995100323.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/65999014143.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613801c74651b---xagisadamob.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/11164739501.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/ratobuvukapema.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/48790199650.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/47056855287.pdfIn PDF document text
    • http://mamam.by/upload/File/file/bigok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=euro+truck+simulator+2+for+mobile+androidPDF 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_off0000ca8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29E 16268 bytes
SHA-256: f5c8733218bfda60221a1d9469c80f4381f149096d6da7cf54d105bac642c990
font_02_sfnt_off00010c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8A 11072 bytes
SHA-256: 59fc24d495ae0b1e633ea1a22b6d0c6652d291878fce5bb24ea73e41a622facd

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