Malicious PDF — malware analysis report

Static analysis result for SHA-256 374ae2cd18e29fd6…

MALICIOUS

PDF

76.6 KB Created: 2021-09-10 21:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52caa7dceb54b86f2207e491535c2a3d SHA-1: c6fd2cfcf6ec3f7b1bd2e04c604fe45fccb792bd SHA-256: 374ae2cd18e29fd663817067c2f7b4dfc40ba04d650b0ab782dbac55693befab
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 websites or disposable hosting, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with ClamAV's detection of 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution campaign. The ML classifier also flagged the PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fmmvn.net/userfiles/files/lolezewitugilabeweluli.pdf In PDF document text
    • http://montex.pro/uploads/userfiles/file/46180994209.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/hpbab1bjqs17dcsco2rtdor61p/81122562773.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/79834642730.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/63070663531.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/16778946212.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/vujikose.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/kunixemupemazokago.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b582cea3ad---guzikafolenaje.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/20370141982.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/xejitexar.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/porokoxinevinevatemivo.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/suxepuvare.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4519d05b---napumamobedulirar.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/sivazonozuxesubuxi.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/wilamodoj.pdfIn PDF document text
    • http://hexindechem.com/upload/files/55114339584.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/tunorasu.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/gufekoziwozetaw.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/popifutunu.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/puvoxuwawew.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/92977786771.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/rubunevoduxinegav.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/patajosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=demon+slayer+manga+pdf+free+downloadPDF 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_off0000c36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 10852 bytes
SHA-256: 3dccefaca847f402a95fc258ec7a95f4a277439b11505335271a942f1dff495c
font_02_sfnt_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 18472 bytes
SHA-256: 1bad190f5f19bcf8b8769c186f69b743fb4b3fb3bea30bb3ee0f1bdc4c8a8c7e

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