Malicious PDF — malware analysis report

Static analysis result for SHA-256 8477bd2293bcedf0…

MALICIOUS

PDF

178.4 KB Created: 2021-08-19 12:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9e2fda716657381aa50bdf1479442a6e SHA-1: 638576a5caa6b2302174fd1cc9b3b2a313115740 SHA-256: 8477bd2293bcedf00d5c3f99e42b375458bc401ec0311e951da46239234a17ec
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to domains that appear to be compromised or used for hosting malicious content, as suggested by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The document body is unreadable, but the structure and URL patterns strongly suggest a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9485

Heuristics 6

  • 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.
  • 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://olimpic.hu/ckfinder/userfiles/files/8266866029.pdf In PDF document text
    • http://kapsalonindex.nl/images/uploads/sobir.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160945f754dfb2---32469675362.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/23035585095.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/gusedexasupejenisokux.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/kiwefodupofeganidezu.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e0519b4e92d46fff829cc825a40e5c85/lakiful.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/67442645050.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/08bfc0uqtggfbucfqbmvqddn3n/27037578632.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/28e3e61a4b45a120140cce97b92a737b/tatinuxeruresubajovuvaxi.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/43043565790.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/93733641763.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/xovepozesunobajogurol.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/30753541792.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/67295517104.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/149adc0383c524ae309e57ccdd69fd54/93485147559.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eca0d1e583---47797556263.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108129e61d3e---76307618017.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c87e076de1f---xisidadoku.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610b25106b545---korezepapavifiwopiri.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/40204314366.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b6c73d4c6---10679628727.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/15164155147.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cff3e6d1fc---4906291369.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210625_084956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tabla+de+valencias+quimica+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_off0002560d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2560D 10880 bytes
SHA-256: c14526ac5ad6dc9267fb455dd88584aaa85f94adbc3c6992ec608a1e3a61dd19
font_01_sfnt_off00026ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26EBB 19292 bytes
SHA-256: 683273ea2b60f69e6f4eb8ee58e88a7f11345c3526f3c977fa4243c8e03fa974
font_02_sfnt_off0002a079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1