Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c60e3f7b05e2da…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 09:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 528799f05551b96d9ddc6ec46b45b080 SHA-1: 4ce4c18ef7c616830854d6d5b330fa4a6665c9b9 SHA-256: e6c60e3f7b05e2da85b4d370c65ecb3c559b45d9074b51b5918b7a375369904f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable hosting. The heuristics indicate a link farm designed to obscure the true destination, likely a phishing or malware distribution site. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially being used to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://budka39.ru/files/41384801766.pdf In PDF document text
    • https://skvely-kup.cz/files/file/zazukozubevinemov.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/jeduveribogaxelukowir.pdfIn PDF document text
    • http://odumakus.com/uploads/files/rodafadage.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/vewobo.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dezoxoboxexemabekijiwo.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/88959702617.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/lazusafamopabuzoxewono.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/tesufemixipebewel.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee27f244d---walerafataluragi.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/37571718157.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/64255f1a874c208db54f85bc24d577c3/47265052606.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/60283489698.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/14476143742.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140f3a751660---kirubuxugemokiz.pdfIn PDF document text
    • http://sun-eko.eu/files/file/ratosowisu.pdfIn PDF document text
    • https://12shio4.com/contents/files/1645387651.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ea4616d79f1a0d06ac1a2ad0282d2f0/lodenazeganu.pdfIn PDF document text
    • http://millecolori.it/images/file/97066814040.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/1333207109.pdfIn PDF document text
    • http://stringladies.cz/userfiles/zaxupalawifugepezimax.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76041846355.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/misapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=geometry+dash+download+pc+windows+7PDF 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_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 17132 bytes
SHA-256: 7f9633bf2f114f6f5b03f50db5876c377b83a040ece1252bbcb76c0762f6eeed
font_01_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 11068 bytes
SHA-256: f20d7a7d34e0ae8f3613d1a178fbdcb4ed0bc4de3364263e1cd2918857c7704d
font_02_sfnt_off00012a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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