Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f05a917b837401…

MALICIOUS

PDF

91.6 KB Created: 2021-09-03 14:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 71ffc7ff34ebf882784849a2ed1e1ab0 SHA-1: 7dc6130b7cd7e1da29a767799aa7461b0fc89fe4 SHA-256: 05f05a917b8374015755c8c32dff50338cec1ec0fb53f39847b43c4efae0e1de
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

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 https://himarco.ir/basefile/himarcoir/files/wafaduturira.pdf In PDF document text
    • http://sunjewelsonline.com/userfiles/file/vowuxofibukikuvofilo.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/14355781069.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1a355a96---pobofik.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3a9b770e378ff2042545767a04153c98/97704111217.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202108110743473715.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/56850342365.pdfIn PDF document text
    • http://freeorden.com/media/file/76402205899.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/kijikusol.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/41190125949.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/nojoguwadoxuwafa.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8fe813994---wijatakenilijekij.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/145caa3e7e15b43d22e8c1b7a692a40d/32766299081.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/bewevugepudemijof.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e8853bf73---28044863076.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/44673304479.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/deguwemamoxugidapowelabo.pdfIn PDF document text
    • https://mcsfood.com/images/file/makagilodevoxupamozalo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160801670496ed---sonoz.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/11108293377.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880877df3e6---vuzigapodilemozalazomi.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/somavulodipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=brainstorming+list+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_off00010201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 10764 bytes
SHA-256: 16ad21cd7febe10fac78d9198b3b3ef7aef153a2d531f3af19eb5558d803a5b3
font_01_sfnt_off00011a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A86 18056 bytes
SHA-256: afc61568e616940401f1a801f613e697456bd40ebc2dc3da858763c7ffbd77fb
font_02_sfnt_off000148ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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