Malicious PDF — malware analysis report

Static analysis result for SHA-256 b739a15941ce607c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 15:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6545d8f4df5df248354fe5f6f758ebd2 SHA-1: e4fec04ebeeb6e2cdcb29021f1e3c0ff79a66a61 SHA-256: b739a15941ce607caf517793ffb3c0058654876fbc0cd9666a183ea599e81956
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised WordPress uploads and potentially a phishing lure. The presence of external URIs and a 'download button' heuristic suggests the document's primary purpose is to trick the user into clicking a link to download a secondary payload. No scripts were extracted, but the overall structure and heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chcial.ru/uplcv?utm_term=pokemon+jupiter+download PDF link annotation
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5f0f1fe5---68521806213.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/75371020394.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/guvakovorabe.pdfIn PDF document text
    • https://primer-spb.ru/files/files/77118016581.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/vugewuxenafipepupegasuva.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/fuvotuletedinosarukawefok.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210910_6ECD945F78653356.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/sivewivinam.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/toribu.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/pdoqgdk8tssj3gf9vbopie6a2q/1617585809.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/11538173326.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/46203686504.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/dazozitapifezopi.pdfIn PDF document text
    • http://52963566.com/upload/file/202109140550412936.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/gizerovuzironozabokena.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613021b29b395---rezoropofomezusijuvidavo.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/9633580255.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/37291772680.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c9eaeff4---finowedugesegonujuku.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/60424185904.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/bokatawifanidosevis.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/pamogupipotitowoninijuv.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/gizovabifi.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/bowuk.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/79184889528.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 18936 bytes
SHA-256: 405ffc8cd5f5619a6ade90e6967d958e604fda7f9d825fe7889633ef03c6eb66
font_02_sfnt_off00011efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 10796 bytes
SHA-256: f5351d210517dc5b78ace0d289f3d28cbf5861492901e7a3a90f1f582dc7167e

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