Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4db2e6e4b70a185…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 18:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 15871d1cd83cb22dd0f5055319b981e2 SHA-1: 53916f9729ea1d215ef8e613e0f36c0708f2314c SHA-256: d4db2e6e4b70a1850f397610ef14abc3a702f3f94d4ddfe8f50a6a5de23cd86b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=atomic+radius+for+calcium PDF link annotation
    • http://merwepizza.com/upload/file/33129102771.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/bunifufivojuwis.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/59608762360.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/jiwijejigi.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/sezefetigosinadekofumig.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c72d86fff---fonakaro.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/18017709015.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/37409369070.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/6187996046.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbed6ecfac---tumoxo.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/94112612271.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e267fe16d2---peseviselabi.pdfIn PDF document text
    • http://tchid.net/userfiles/file/80998054438.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/54357686998.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/27673856602.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/mevizir.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/73312034257.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/62f7c42c57fe5160269c499f6e5a47cb/wopebelipesajilo.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/jizuramojikam.pdfIn PDF document text
    • http://hzqzg.com/d/files/70044356778.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/darudi.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/34188847838.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/89307534526.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/82914018579.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/67331423162.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_off0000df20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 10480 bytes
SHA-256: 6d889ce01b132731cfa789220a9753fb82f8750a3160ddfbd40bae994e81c229
font_01_sfnt_off0000f6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F6 17168 bytes
SHA-256: 376e04d53bd78ddf81e9128379ae39d5cf66f7a7694167b2ea326b1fce310884
font_02_sfnt_off00012355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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