Malicious PDF — malware analysis report

Static analysis result for SHA-256 462db672eaa71bc2…

MALICIOUS

PDF

107.7 KB Created: 2021-09-09 17:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d91206eae070b926b41acd3d2dfc5912 SHA-1: 7cb5848abb84d0b96fa9ed1ac76321c5d2c68647 SHA-256: 462db672eaa71bc247f4a41fda210913855f1cfc050cb7742a4af7c635246977
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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 https://smidgel.ru/uplcv?utm_term=harry+potter+book+set+free+download PDF link annotation
    • http://fulns.com/uploadfile/fckedit/file/16304751929JW9.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/sapesunegodeda.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/jozotova.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/bajifovoginetaxana.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/sulazipoge.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8d26f5f2---sigafapegefemumivutobesa.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/6182270088.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7134a33a---92179672337.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/gitasaxalitogikegevegepe.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/33879403969.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bfe05b646---87619891049.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/25319671248.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381e9505f91---merepi.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/namifaxamaxo.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/sokuludotazelarige.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_off00013e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2F 10824 bytes
SHA-256: d3490f4b5b90d348d7c51bde0683dbae573147006da5a94a96950abcf571aaf3
font_01_sfnt_off00015724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15724 19332 bytes
SHA-256: 5d9ecece08703e8e3919b92d3b4476f11b4db7359ab7890a610b80aa3a6d7350
font_02_sfnt_off000189a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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