Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55205c402477a20…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 19:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a7a36705b695f9cc230c9af403305bd SHA-1: 1b1bf2a24db48c8ab27b4ec1abaee24370f0f52d SHA-256: d55205c402477a200ddd9cee203bc77b0457d5b771cb734450d50d4678647aa5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary function appears to be directing users to potentially malicious or compromised external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vattuxaydunghl.com/userfiles/file/tufomapowavude.pdf
    • http://immobilieninvestors.org/userfiles/file/kekazapebaweliwulun.pdf
    • https://vegan-eshop.cz/data/file/21309061913.pdf
    • http://youil.org/userData/board/file/84392932620.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/xexuzimekeliwogalipo.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a21eab7d42ca4cb881b3a18cc93837a4/62330241351.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613878a5bd801---79247379450.pdf
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97235936784.pdf
    • http://vilniausgreziniai.lt/userfiles/file/piviw.pdf
    • http://duhochoangthanh.com/upload/files/vanaboxaduga.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/228cacf574e423255754732d1bf2059b/67758645923.pdf
    • http://secondhandgraphics.com/usrfiles/file/refebufebaduzapib.pdf
    • http://golden-candies.ru/webroot/files/files/kadozowoxiravuzutiruw.pdf
    • http://caratow.nl/userfiles/file/59450252954.pdf
    • https://cyklo-wellness-penzion-palice.cz/content/98174681502.pdf
    • http://k2plusinterior.com/userfiles/dekigomeg.pdf
    • http://sziazsauto.com/uploads/files/28527425482.pdf
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/barimelomejifak.pdf
    • https://mimpiindah1.com/contents/files/kizuzewezimamimaxel.pdf
    • https://ipekyolumedya.com/resim_galeri/file/lagedetukugelak.pdf
    • http://gpsputhuppally.com/userfiles/file/fubumumutupomozogavu.pdf
    • http://gt-outillages.fr/ressource/site-image/files/73169875569.pdf
    • https://interconformity.ro/images/file/10704906651.pdf
    • https://teamcode.net/upload/files/36207628207.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mortal+kombat+202
    • 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_off0000b315.bin
1e430fb2a6997e616f62bdd89ed7efb6b40fc7d6935bf6053ed054b94f839873
pdf-font-stream PDF embedded font (sfnt) at offset 0xB315 16100 bytes
font_01_sfnt_off0000db72.bin
e543b011b3d5ce1790cf1a5a13a23f8d11634cefbef5fb17e8a2d780264e530b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB72 10240 bytes
font_02_sfnt_off0000f28a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 16792 bytes