Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbbd3506d547689…

MALICIOUS

PDF

86.3 KB Created: 2021-09-17 11:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4485c31c34691208e33ca43f02760960 SHA-1: 5809fd22a37c106a88467f66e55bc0e12d59ace3 SHA-256: fcbbd3506d5476891d8a74764eb1fb0faacfd807c2a3e86777396c9f0d0513df
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of 'utm_term' parameters in some URLs suggests tracking or redirection mechanisms common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://poltinka.ru/userfiles/file/dawuda.pdf In PDF document text
    • http://rabotatver.ru/userfiles/admin/12872400997.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/wofekulafebexed.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210906075042_1585742147.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/82543356491.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/37870528420.pdfIn PDF document text
    • http://malifer.hu/upload/file/30698000629.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/44424819856.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/kakijiji.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/71997596817.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/72201167705.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161404b97183b1---wopovebefidaludom.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/wogivupanopefokoxidaxiva.pdfIn PDF document text
    • http://vpsystem.com/files/fck/35931092325.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/vufajedofelukoxale.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/mogelobu.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4724cc9b7---19101398492.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/vafanofajufo.pdfIn PDF document text
    • https://ka-base.no/images_students/files/64045294796.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/wivapexomafiwowizexu.pdfIn PDF document text
    • http://marketingnews.fr/images/file/jegozivut.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/gebipasuzadosenepiguma.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16141c935b121a---vibarati.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/44344770791.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342c9d51503---55119479427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=c%2B%2B+yashwant+kanetkarPDF 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_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 18096 bytes
SHA-256: c4493fb3826ae5b821d4a38201a0ed7789b35fed805d10b588741d3f53cc0a77
font_02_sfnt_off00013454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13454 10268 bytes
SHA-256: b355d9a10a020637453c385176c018ccaaf52054534833faf41e9e6df1c83db3

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