Malicious PDF — malware analysis report

Static analysis result for SHA-256 844378408dfa89bf…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 02:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6a2e62145d029d68ddedb3a2f77ddf76 SHA-1: 1736f7ae1b2eeba966be301019e746f4faae7155 SHA-256: 844378408dfa89bf2c748ac9bfe2f4a67b59d4351db20a686b7b1b0b8e6a8b8b
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous URLs, many of which point to compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://condominiovillage.com/userfiles/file/vegoxusivixedajafojiba.pdf In PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2adf24f75---xafujusamasidefozeda.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0fbfcc9d236d7da6514157545a881c9a/jasakepebizonatepuj.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/bupojowototegewiromage.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/bigeguvosisutuso.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/79985932920.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-11/20210611000405493131.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/lafimolaka.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/60217865450.pdfIn PDF document text
    • https://bselink.com/userfiles/file/tunowofoledix.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d202bd8823---54939911360.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n7si40kj74h3ncqbd5dgtndd94/41561563860.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/94501805405.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef0218a313---figiko.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612ad213e8076---10877113610.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba796bd7e48---90601329299.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607374049e18b---zulikoxukototu.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/mewemefanalitokuxiv.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/dizefodobopefa.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pagovazekesuwunewapuxezex.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/b109f2cf2f9900b10a03ad21c7ee788b/61230510691.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/32618986617.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/22262017208.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/l5r1dhfad41n7gjp6e8avlpbdq/65454899963.pdfIn PDF document text
    • http://ud2-140.com/files/12162968761.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/08fde3ffb308e1215e71ae9b0768d635/62190160417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=photoshop+change+the+background+colorPDF 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_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 11032 bytes
SHA-256: 85fdf53e30b4644f1884d2dd29f6f26ad39580792b41816e408e10ea762356fd
font_02_sfnt_off00011c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1C 17712 bytes
SHA-256: 5d3db26e84b3ba18e33fadcacd4b4576eaa0fd21727cabf09f6c639f168381e3