Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdda41ef8469f3be…

MALICIOUS

PDF

87.4 KB Created: 2021-07-02 13:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae3846e086429a6a23f0477faaa9803d SHA-1: e2ab6e1a07227a9789668c10a81c33cbad7aa7e7 SHA-256: cdda41ef8469f3bed4361d14bb155db4b6cbaf5a6d34d248a9e16e0bd166319f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised or disposable hosting domains, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and a link farm heuristic strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://balajitutorial.com/admin/userfiles/file/61109952308.pdf
    • http://maxidmum.com/images/upload/fck/file/14705620538.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6uhvedukpgrdu9joc8u56n8ibj/luguzipujirosot.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de5391e1949---25223587385.pdf
    • http://maychamsocda.vn/images/userfiles/file/59824617060.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/64baa5dfbc41a530ae945127c8b6f9d8/pujozuzuwinumupageji.pdf
    • http://kpdb.org/userfiles/files/bejodovuzugalotip.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/13214730980.pdf
    • http://aldara-latinoamerica.com/userfiles/file/bisibewunejevorufat.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e05b16cc7---podirexuzezesanenipuxexa.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/b2j7dkadtr6rajl053mh2kc4d9/97360629657.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27b4f3ab3b---38338071614.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/e3a039bda306b12280af7a5d76db6aa6/68493915680.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e8f6befa8---44693532284.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/54598894908.pdf
    • http://doktor-okonski.pl/uploadimg/file/12693719283.pdf
    • http://johnmarzillier.com/ckfinder/userfiles/files/bijuki.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d850369c0---motunuxufetedadatobewefi.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5da9d2325---falikolebowiko.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d93cec444cc---mazikoginunipotag.pdf
    • http://allycatering.com/userfiles/logotifivafijozufosunu.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b585ac2b401---nisev.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/k7pda7fvahu6n9t6elmlteor70/deninodemumenidosepatodo.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160892e9e68ce0---27036700880.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abbbb592bf9---fajuzefa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=signs+of+split+personality+disorder
    • 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_off0000f458.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 16792 bytes
font_01_sfnt_off00010c6a.bin
53334ad06b29fb50b29ae8c9b57e58fbda39eb12d217557b960a1c3d17b3d62a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 16656 bytes
font_02_sfnt_off00013771.bin
4a98e8c35c09811d6c65c31971ad19840a37ff8000f3bc1e8f1ebe20a971729d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13771 10860 bytes

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