Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd3e3138f0aada3…

MALICIOUS

PDF

89.7 KB Created: 2021-07-26 13:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ccff7b1443c33803c74b22444492a7c SHA-1: 197ca85954c453db1adc4a09444854a0def4f360 SHA-256: cdd3e3138f0aada367a5f1ad91697e641b917dcc652ebfc1d166d6558fca6e66
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, as it aims to trick users into clicking links that likely lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cestovni-postylka.eu/userfiles/file/47985575531.pdf In PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607a906bb7621---5486198712.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/59927903877.pdfIn PDF document text
    • https://atl-50.com/files/file/suwukakigagamegenerovise.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/xiviwigagaxozilalaxibasa.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/70640378765.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/73567345324.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dgu6jvtov3d994h30sq8pmf0kt/64980627221.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/948fe4d6eedd42dfa73d6fc5ea44b7fd/tovapomo.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/90353813052.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/vigevemapowaronula.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/f3nt70khfvc5nuevvedgoaq3n5/subito.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/74380818179.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3785a3c9c---33356979641.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae3595785a---xuwameturibenemoreravoriw.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/99t1n5c8fb4prbgi6b5r2odcar/runipamogirebopikelaze.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609a0d2101e25---64790481852.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae6a7801ef---renarapewirusenor.pdfIn PDF document text
    • http://zuche0551.com/upload/file/nevefutasaloralenutitu.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aae3513f297---60711626182.pdfIn PDF document text
    • http://kimtuong.vn/isc/public/files/fckupload/file/namonivufuxikowimuvere.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/gusosomuwut.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d15c57e91---88057430860.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efedf71f66e---93807360771.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/18kskrhfio2q7hjf4s3a2mgtq3/14439178341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pokemon+the+last+fire+red+version+gba+rom+downloadPDF 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_off0000f477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 11184 bytes
SHA-256: 2e9b36150befb6e688cc6aceb39a76a7a4a9dfd5a4e2243097466217cfca8ec4
font_02_sfnt_off00012657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12657 19920 bytes
SHA-256: 41aeda085704e46627f627e84403348d08a7a9d172e191189640dfd369c1de9f

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