Malicious PDF — malware analysis report

Static analysis result for SHA-256 df614966c3e21e21…

MALICIOUS

PDF

68.4 KB Created: 2021-09-30 11:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7edd23630e869b58899126f30a91167 SHA-1: 62ce71b879d4190bfabaf16aa82d4dfd8d9d5bb7 SHA-256: df614966c3e21e21c2599403766d4d28447c5def9c4d214138695e7092fae343
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://vrieshorst.nl/images/uploads/file/rameliwunujokogutalu.pdf
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/rojafesom.pdf
    • https://crownprolaw.com/userfiles/Proj_Name/files/11853930191.pdf
    • http://autoklej.pl/app/webroot/media/files/48430488894.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161504b0b788e3---xalipiwasuzemetoli.pdf
    • http://dgkno.cn/upload/3514312173.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161507acb04ed1---bonipadodemexowuviw.pdf
    • http://taiwan-tsai.com/upload/files/83456514315.pdf
    • http://sevinctekstil.com/resimler/files/39285267235.pdf
    • http://ccswcd.com/userfiles/file/14573611814.pdf
    • http://fabrikando.com/cmsimple/images/file/29020929484.pdf
    • https://tradingphrases.net/userfiles/files/dizirew.pdf
    • http://www.zywawiara.pl/pliki/tutuzenuteweg.pdf
    • http://stagelight.pl/userfiles/files/7825681769.pdf
    • http://msinziniering.com/userfiles/file/26490546636.pdf
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28084750423.pdf
    • http://eternoohydro.com/d/files/49957893485.pdf
    • http://tavio.su/files/file/26311894714.pdf
    • http://solmoda.it/userfiles/files/xopamuxawuna.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afa4d24c62.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16152cab057bcb---kajeterimisilala.pdf
    • http://stellarp.com/userfiles/file/14046476573.pdf
    • http://thumpamonpally.com/userfiles/file/gekivuluxuxetarumara.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=friends+the+reunion+full+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adbb.bin
ce200beea0a375e97fd9d66ec48f4530e0e90c55f6bd093eac36b96a1a9c0348		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADBB 15380 bytes
font_01_sfnt_off0000d503.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD503 16792 bytes
font_02_sfnt_off0000ed1a.bin
36dc4f5d93f21f8661e281b862ff525fa96fa045047ed3f448daa1667fd0c98e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 10364 bytes

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