Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee783cdcce3380e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 05:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dbae2dedb3d1c8ed1fd3a872af9638f2 SHA-1: 2df740863a1ceec4673c8cc517f2f9f197224f70 SHA-256: 1ee783cdcce3380ea81e408cf62ce95f136ede51b0fa95c192bd5f2223483a49
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting. These links likely serve to redirect users to malicious content or phishing sites, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.cerathai.com/image/upload/File/tolopimesunujoba.pdf In PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/ruvugegage.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/54974609673.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/24ec8dc5ec5f582e350547232d035481/26426900889.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/tazowekonikob.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/xiwipetowetefe.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/32145730566.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/80194665586.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161014178b20d9---90516739973.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/sifupixojapeturiruwifep.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/84268544499.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098846990a37---61343727719.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/81d40d7168498cb0381dc8fc9281d664/75202359100.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/lanigokolon.pdfIn PDF document text
    • http://cosyromania.com/media/file/24763555843.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e2084191d8b31c57b082f35b9f03a593/paputibofutigetelari.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16101354f9fa00---xizonaraxudot.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021082816561010.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/sezegilijipu.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/58128793178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=middle+school+peer+editing+checklist+pdfPDF 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_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 10824 bytes
SHA-256: 4b03c31b6499d83d77ead4f92ed417a4be4ef8ff802964557df7b72abf871d7c
font_01_sfnt_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 17060 bytes
SHA-256: d386cc6235aff9fbec8aad6932e361bf0b587be1d3cf88c447493d43a42a2f65
font_02_sfnt_off000120b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1