Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4f53e3aac1d649…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 22:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dcd221c199fe5398bb444b447af080a8 SHA-1: 3c43250778998dda642a8b4a899dbc70236b61b9 SHA-256: de4f53e3aac1d649be65bacff8084b0f070d23e16c5c8803b5105cf5a135eebf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content. The presence of these links and the overall structure indicate an attempt to lure users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c52de0108bf---mezasekivolo.pdf In PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5208107288---bugukewezif.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/85503670132.pdfIn PDF document text
    • https://knjizara-harfa.rs/files/97343620652.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/980353a478430f15f9062f2434c0e838/85944815955.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/800f7170382d7ce979e5084d5367b604/lewilivapan.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/jijamunilamedawagukijiris.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/118281500.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d554d59935---mowibesomiwuwuv.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/33777051495.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee121361449---bapojosedazu.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/fadf0b083e27d07f2e445b1ac64541a6/gebur.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/rupalo.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbeb2adec81---13837315625.pdfIn PDF document text
    • http://technocom.pl/editor/file/97755127175.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ci4c2sohtcho62269p3kail8c2/zalazasama.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611542eabea09---bezixaj.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/7152139599.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d466ae8b525---zedigarabojuluvuguxo.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///xupexukumenuxotokefijo.pdfIn PDF document text
    • https://landbar.com/upload/files/gubotem.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae3e22eff---75656205594.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/88070850179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=william+beaumont+armyPDF 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_off0000d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD988 10448 bytes
SHA-256: 42b46b270946c693c170a6b8b0589a99b40d3fb12c5993d0677b6fdcb1b1a528
font_01_sfnt_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 17580 bytes
SHA-256: bcca03069c15cf5006c5aebde4788e4ae5e99bb0cc76e44a5d372ecf75de52b0
font_02_sfnt_off00011ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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