Malicious PDF — malware analysis report

Static analysis result for SHA-256 6998c4cd74f2c69d…

MALICIOUS

PDF

166.1 KB Created: 2021-07-15 18:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f16bd8f4ef98c7f3fd1ce72081d3068 SHA-1: ba33c478838e154708c1b1af8125a847a29641a2 SHA-256: 6998c4cd74f2c69d3e50b056aca3c3d213a38befbd9d251dd2829eedc2d60991
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 or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the heuristic firings clearly indicate the presence of external links designed to mislead the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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.contectrade.hu/fckfiles/file/kizof.pdf In PDF document text
    • https://haysalon.com/public_html/userfiles/file/texukaloleturumetativara.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2c8dc241---bufoduvasogetoxatekisoxe.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/3583if8j3049u1f7o7hce4j5tf/zujid.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/julovupujomiditumuzunira.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ef8dad83---rawutuf.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb81c91ca8---67033245763.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/a33e27c612he0ft9oikq1biglt/lakagedaliravipimaziwi.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/57245563250.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/14854031954.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8cda63b3bf1e04439840be870dea746a/gupifemexiganipekikiva.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8db8de9f5---xupekivodowijageduwetu.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/5229557812.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lv5n3p0iadvu1hn2d1g9iilmm3/xudafepunawifadujobiwige.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/vuxomatujen.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/82351592772.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dc32bdcd8c4fa39c30e38dc32a56eef8/gepovarizofejen.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/63ac4ec7f9b9a011c26eca9b4e5a6d49/13863799714.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/40332356684.pdfIn PDF document text
    • https://isosklo.cz./uploads/simadisuzasevuroralonelu.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/1533257651.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/98085308747.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076890dda78c---naxofo.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0cfe264c196391c441de659792be567f/xesena.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/weruxadewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=equivalent+circuit+of+single+phase+induction+motor+experiment+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_off0002204f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2204F 11464 bytes
SHA-256: 387af259507cec758dd7ac2b5d8d602a71da3e137c3d6442683e01e71278c796
font_01_sfnt_off00023abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23ABC 20840 bytes
SHA-256: 9842361b0c99d6dd8ad18a80101fa6e8d4a4f9bbe3a1c66c3b9ee1c70af9f8d0
font_02_sfnt_off000271f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x271F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1