Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd0fd4cf2d5d8c4…

MALICIOUS

PDF

89.9 KB Created: 2021-09-12 02:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8297fd4b2a9af322afed0257c8be1c9 SHA-1: a3bd0b18bdba05e2ce363a4ad9645c09d87d852f SHA-256: fcd0fd4cf2d5d8c4ebc45f84e5d48fd18c6051e5989614921a5d55e25977f7d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm hosted on disposable domains, with multiple URLs pointing to compromised CMS upload storage. While no scripts were extracted, the presence of numerous suspicious URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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 http://ucg-eg.com/userfiles/file/51896439424.pdf In PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/fawuneru.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/70345857045.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/wekodukepopas.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/89753b44efcce744bf8bd207d6050cfc/xumomivofagusopozibuxi.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/5140325604.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/vaxoxofed.pdfIn PDF document text
    • http://erpos.sk/data/files/susogalum.pdfIn PDF document text
    • http://le383.com/uploads/files/wodot.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/tawaren.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16139e59ce1361---19891045507.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/dawonagakovar.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/teleripimiramam.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a42638e32dfd5361dce04c791c68e7a2/37074184370.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/60244188934.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/97947788663.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/taxasikevepujusaz.pdfIn PDF document text
    • http://attlas.center/userfiles/file/63200084386.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/balopefegozudogoz.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/xafimeze.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/67009898144.pdfIn PDF document text
    • http://qdjshg.com/files/file/42930632092.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/92775959807.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94190523238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=can+i+chromecast+my+screenPDF 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_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 20484 bytes
SHA-256: 9f5438b73ad2246577de93004e0978228b257996f6531451906e0a7d048e4271
font_01_sfnt_off00012a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A04 10592 bytes
SHA-256: f250e25d284da8d83e15531b7eb71b242ccb6f8dd1f7618c790ad9faea815973
font_02_sfnt_off0001421a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1