Malicious PDF — malware analysis report

Static analysis result for SHA-256 314f0de1dd8bbb5c…

MALICIOUS

PDF

67.8 KB Created: 2021-10-04 00:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 24bba108b487772f4bca4e56482c10ed SHA-1: f930c5b51002cf0099a2e86d6db50f0e87a82e77 SHA-256: 314f0de1dd8bbb5c8f55b98b11a4e52868581ebc0ff0a634b7ec121b4e88e52a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains or compromised WordPress upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://infrive.ru/uplcv?utm_term=it%27s+off+to+work+we+go PDF link annotation
    • http://simonide.org/userfiles/file/33782416582.pdfIn PDF document text
    • http://humanlitech.com/files/files/17891810423.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/pesojisexinusojuri.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/jabipova.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/22745850820.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/615177bca8721.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/tipawavesudaxerefizu.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/dobulosidisegevexixabi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210911203138010.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/sepofukidilokatisuxubexul.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/597e83fbae04ed73afb2ed8d8d44588d/tenetebobuwufepe.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210909011320.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/87ejm0bipavj841neb0bfoq1ag/12484221102.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210901084211.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463ac76cdc6---2157027766.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/88033621749.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/23237685171.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/85023242794.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/q9h1ea30nro1v8gge4kup740n7/41014434867.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/xeweputuf.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/90613414649.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/23171701508.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/puwababuwisepemanutupuza.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_off0000adb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C4 14732 bytes
SHA-256: 79b6ea5b370f36530168ce7dfc24cdd1ea724eb6efd64a147a1b918ad6d69e15
font_02_sfnt_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 10148 bytes
SHA-256: a324c4931677b94659082f8f30e7c4f43ae62968fe04a8bb01c1ba3777a75d1e

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