Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f03f1df56178672…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 06:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bfb08ec6fbada33219e06b9b962f2cb4 SHA-1: 2a1a4a92c4f9b5a62aba76513e7921db05464779 SHA-256: 4f03f1df56178672bf77d0bfb3df69c363c4b376a18a76609d87edfc9ecf9797
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs strongly suggest it's part of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bestapp4u.com/admin/uploadedfiles/file/ruzagopabutarotopejogufa.pdf In PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/fee26856b92d70d72325651607a00289/20267774733.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8ca298c81---nuvanigur.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/jifam.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fddb06702---zewinipivoto.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/87473287861.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/nijeluf.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1d3d0139---14377720322.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/74267682483.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/16294ddc29ff90f096c00f57ef1e8b71/69397384546.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede6ec6526---dedij.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/vuvefa.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160824f1f3e5fc---96373544163.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087d96815ce2---39065985267.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/3738529188.pdfIn PDF document text
    • http://yoron.net/up/files/3701062398.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/97281534580.pdfIn PDF document text
    • https://magerp.org/upload/files/54939629955.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/73263156687.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/41555944815.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b878d83883---muwoxopofoseserefawemal.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/72296930314.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/48819476729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hermoso+nombre+acordes+pdfPDF 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_off0000d73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 10676 bytes
SHA-256: b9c7028c152ebd322d3be56d9e39fde89e97d2de68785d4862b34f6c1aca16a0
font_02_sfnt_off00010783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 18780 bytes
SHA-256: a53240a1acf271534ed0ed8529c096313f9ff17faaf53e17cacaa5634567e55c

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