Malicious PDF — malware analysis report

Static analysis result for SHA-256 6187a11befacf216…

MALICIOUS

PDF

74.4 KB Created: 2021-09-21 16:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5fa68845dcaa0162a4ea594739e816f SHA-1: 315e45322da521c5d099300a849a1a0e210ba411 SHA-256: 6187a11befacf2163e625d8faa05f6d836c7c3a8244e6f0c4721fcd1da885c9a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of 'utm_term' in one URL indicates a potential phishing or SEO manipulation tactic to drive traffic to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://philabc.ru/uplcv?utm_term=conjuring+3+movie+download+free PDF link annotation
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613174d14415d---80105065858.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/76925429625.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/98044646312.pdfIn PDF document text
    • http://cncsprings.com/d/files/duvexokolomeko.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/gotig.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/58135440873.pdfIn PDF document text
    • http://jljemc.com/upload/files/93115279658.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/dobakaxanabevatopuxijulex.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/sogebunorev.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/78824463576.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/29659459113.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/poxavikatevuxenira.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/39841322389.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/danabikonivevimot.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613286e45f838---1478789551.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/miket.pdfIn PDF document text
    • https://desco.scp.hr/files/fuxale.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/2299240670.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/60853549514.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d95a2fb72f48fc066c6fd570d1b1e40f/betijonorapimej.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/wegitisajotamagu.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/bazuzusevunitawutez.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/naselizadavelegifin.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/23614386630.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/25603051057.pdfIn PDF document text
    • 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_off0000be8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8F 11016 bytes
SHA-256: 50c6b440a8f6a8037180bb56a66bd68d46d7850816616db43ab0aa28619a7b19
font_01_sfnt_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 17096 bytes
SHA-256: 878c99158f3e7421b4c73ae2f1d6c86f6eba94da224636a1b4c9db4f18b5cb14
font_02_sfnt_off000103f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1