Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd07e84a7d0ec0f…

MALICIOUS

PDF

88.8 KB Created: 2021-06-25 21:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f4fd94bd60af96284febc35fc0a7e42 SHA-1: e51c15160c595923696b7495f8fec9491af17a5f SHA-256: 9cd07e84a7d0ec0f07f02e538516c897d22bf3619b2e4f258f38d63edec91da6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest it's used to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://xn--dlek-5qa.com/admin/UserFiles/file/43501109497.pdf
    • http://mdsalon.ru/img/lib/file/41013502865.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080231680800---zupamujafu.pdf
    • http://t-p-fortune.com/userfiles/file/62637273880.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/c51d5ofl1qtd37hlljp3oh01pm/40980511948.pdf
    • http://sl-light.ru/design/img/upload/file/bigosewitaxopoburuv.pdf
    • https://bczenekar.hu/files/file/kiroregojoboxi.pdf
    • http://tahi.hu/ckfinder/userfiles/files/xesal.pdf
    • https://bnbtravels.com/ckfinder/userfiles/files/simipigivupaj.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cdfb2c52035---gikimovexadisuroranad.pdf
    • https://agermag.ro/mm/file/karejixelavebokuv.pdf
    • http://tktravel.shop/FileData/ckfinder/files/20210615_CA17E419DD5D737D.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/40412241399.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4beda37a70---95954490097.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/cab5c158096f1c2ff613944cd61aa78b/89196050094.pdf
    • https://perfecthospital.net/FCKeditor/file/vupivanekaf.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b27bc4dec---7020615824.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/lfgo8baf9lggof23b012rkp4pr/14762696460.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/e82366112a2f0cc12e8e6887337a0014/16817870290.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/cc035a78b385be7f300b66a7af390019/54204575380.pdf
    • http://www.kilincsweb.hu/fileok/file/vunusurus.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa25bcd1e---vovonubidiwix.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c739f3d0c7e---83390707844.pdf
    • https://la-klamm.org/userfiles/file/faxaposav.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0afd86aae---jajelubanagefogab.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=effects+of+corticosteroids
    • 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_off0000fc0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 16792 bytes
font_01_sfnt_off00011422.bin
8493434e1fc934170b125a17bd87a1f0580ca29237ad5c531db9387bb398dc3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11422 10140 bytes
font_02_sfnt_off00012ae8.bin
ad39e387173ef9d3914b104225aacede68153286379749596174a3b7d32010e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE8 16492 bytes