Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e7cfd21a4e5eb4…

MALICIOUS

PDF

85.3 KB Created: 2021-09-16 11:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 432ffcb4848742e4cfdd5ea6026f6f9c SHA-1: aa4c70ea104194788062f626cc48086131265d25 SHA-256: b4e7cfd21a4e5eb4b41da1d770d32db8ce30729b9c548605737d81c2009fd4de
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a social engineering attack (ClickFix) designed to trick users into running commands. The document body is heavily obfuscated, but the presence of numerous external links, some pointing to compromised WordPress sites, suggests an attempt to host or redirect to malicious content. The primary attack vector appears to be a phishing lure, likely delivered as an attachment, encouraging user interaction that leads to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://albizy.com/ckfinder/userfiles/files/pulop.pdf In PDF document text
    • http://zonazero.es/userfiles/file/64622665720.pdfIn PDF document text
    • https://phukienbep.net/media/files/tikomil.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316391cd524---75488029104.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/67359145383.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161322a700ccbd---fewuliwazapa.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/9210516328.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/70860442809.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/katoraxukureluxidoxavon.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/79741540507.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/94284521820.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/xosogikosi.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/dujukuguwazewari.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/30448267276.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/49775209505.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/97134413504.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362cd424bb2---lulepemudowasuketop.pdfIn PDF document text
    • https://bachson.net/upload/file/98155558183.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/44204169664.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/sugebi.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/pijirazovitexidasid.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109080022416729.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/pikeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+is+openvpn+connectPDF 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_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 10384 bytes
SHA-256: 818f28bde93a431f21ca8e840d05dbd24e839f46c70edcc8b992e9735891c84a
font_01_sfnt_off0000feac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 18908 bytes
SHA-256: 993539da61e72ecfe32f00285b344234f23c44f1c193e3157fe35df10b4f6aa7
font_02_sfnt_off00012fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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