Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52f0f7b315eff0d…

MALICIOUS

PDF

85.5 KB Created: 2021-09-12 21:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 88ca52bb764d7ed712bfd2789f2453db SHA-1: 3d5eabc7bf92ae46ca1720fb5bfd657733b1cfbe SHA-256: e52f0f7b315eff0d9db6cbba9d11dea457c755814392f66f04311b85b6cea906
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple link farm heuristics and embedded URLs pointing to potentially compromised domains suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yearbookplus.com/uploads/ckfinder/files/97885659655.pdf In PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/gogafugibope.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/78037479556.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/89583591228.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/cfa669442a3ffc89a0f9addf8063ce38/54954812909.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/98359193652.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613da8bd580a6---80868183730.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/dijofu.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/zodobexiloxexiva.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/14581998528.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/gilisalikekijorod.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/72224352664.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/51476509718.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/74460683529.pdfIn PDF document text
    • http://guchen.ru/d/files/9166729297.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/kibatudaz.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a805c18ab---51870820171.pdfIn PDF document text
    • http://vinmexindia.com/uploads/71438954726.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109091525301299.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/fuxedu.pdfIn PDF document text
    • http://balone.net/_upload/file///27980219873.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/razexijevogiru.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/zuzexijubupimunonebolajo.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/norefev.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/49857443336.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/64506190534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=asees+full+movie+download+720p+worldfree4uPDF 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_off0000e902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 11164 bytes
SHA-256: f372a5b8935f77a7fa9bb84f93a0cc28201666cdc7e17c476387dde9e3eed3cc
font_02_sfnt_off00011b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 17256 bytes
SHA-256: 7edd18aa589f8170a6ea05d14e687ad2088b9f3162f833e817deb5c0bce6cb22

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