Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa25373cfb7ee26…

MALICIOUS

PDF

84.8 KB Created: 2021-06-29 11:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bfdef1ab4724e313fa371a4af788d94 SHA-1: 481c73b93b1a14cc2e11892e6fc0d89c3f662782 SHA-256: 6aa25373cfb7ee263bf5577f8dba4ce8a084f0c71dc2f02715c4739c6218fe57
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and a link farm heuristic confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://sunarchegypt.com/userfiles/file/99432540586.pdf
    • https://mygo.com/ckfinder/userfiles/files/xiluvijuz.pdf
    • http://shuswapladystriders.ca/userfiles/file/panireburenozetaw.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/39stjubcktrh3iqgd5k65ed8tr/vuzerewexufovozozajos.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b8812ee2e---nonulamapel.pdf
    • http://halaljones.com/uploads/files/birujozaxetum.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dd5ee103e250cf4a018abf9f62b265a7/jelusunipumaruve.pdf
    • https://quaint-house.com/lisarel.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/e5da76107a89870b0f88509a4baf7b4a/94907680110.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/94a9d1844c30e0e93ce2673571301c90/vojivew.pdf
    • http://adance0112.com/upfile/editor/file/54789102091.pdf
    • http://brainbond.ro/userfiles/file/27322568677.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608857b48c44b---63544938243.pdf
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/2484700270.pdf
    • https://agrimal.pl/userfiles/file/direbifikesobakaj.pdf
    • http://goodwill.pl/userfiles/file/reninimotitajupowadojek.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/j9fbu1bqtsk6qqq0s2rj3r01in/14627170547.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c21f9870c---guxazuzoki.pdf
    • https://perfecthospitals.org/FCKeditor/file/77822638155.pdf
    • http://ambvetfanini.eu/userfiles/files/goxetuxupirago.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b25f1bc5bd8---78019487256.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086806e14ff3---85138203306.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b5s4r73rj641e11fjs3v8buhp2/56086438301.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160878a9cc2024---55182298172.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/bovodanidajube.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609440ae4d261---63286612631.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=office+professional+2016+serial+key
    • 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_off0000e556.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE556 16792 bytes
font_01_sfnt_off0000fd6d.bin
9e0667947e11025a7a8a2f02f4200d6e5d8f031089992993aaff25b5970d81f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 11068 bytes
font_02_sfnt_off0001176c.bin
f370f23d67fd8ad202dec468017976acf184615da8feb72dc22674612989891d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 17528 bytes