Malicious PDF — malware analysis report

Static analysis result for SHA-256 440bf50df2d5eb20…

MALICIOUS

PDF

74.1 KB Created: 2021-09-05 03:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 54f1a839e4cb5b30489a6996f683c5c1 SHA-1: 7220772460310d15ec4bd1516d2e44ceda72fedd SHA-256: 440bf50df2d5eb20f7aa60b7907adfdcbe01d81ef4d72d5cc96061ac36783620
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users. The presence of 'utm_term' parameters indicates an attempt at SEO manipulation or tracking. While no scripts were explicitly extracted, the heuristic firings and the nature of the URLs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=logo+design+templates+pdf PDF link annotation
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e82dc884---kumadelirepugasowumigunib.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/4bd1615058f6b2105b3a43e22c6dd545/9585592516.pdfIn PDF document text
    • http://haai.org/upload/file/varudefadekexid.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/92617990027.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/75475695789.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a692ed0e25f---61183076206.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb53ea7d6---wuzavomusovofozizinobup.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/71705116741.pdfIn PDF document text
    • http://voijin.com/userfiles/files/nofedul.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b22e1c480---72221012966.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256dd80b35---kadonajopepa.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161182b9a694dc---77506559137.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/70580772686.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/bemusagoguwawulowejukexo.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/28850827310.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f8f32e20c---werut.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/nudagufodovuno.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d3edcca7c92345c4c4af93d2b9fa27de/7026940842.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/21537083054.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f35ddbe71c---fuxexujisuligupul.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/18605028565.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b561f8b2096---96760697130.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607880817f227---gatafojemodijatusegep.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_off0000c240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC240 15972 bytes
SHA-256: 2836ffecf1efe7f3ad137bcb4855a923b3d787b539d868c4e3dbf9a34f9c18e1
font_01_sfnt_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 10700 bytes
SHA-256: 0c89f46e7dd07043500ecb233e102740c32e1c5bcc7b393d66ee63d0cbf9a360
font_02_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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