Malicious PDF — malware analysis report

Static analysis result for SHA-256 48333e26930dd5e1…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 06:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6abb03a6a8d97b3e6b55b68c19b6e851 SHA-1: 7559019c6bacfc90ae288978c14adee102aadb10 SHA-256: 48333e26930dd5e1bd308d06680e4fe11a51fb5198522b94961a0dc094340df3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, indicating a likely attempt to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were extracted, the structure and embedded URLs point towards a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/8lrr0rk5nfov41ok4dscf20qdp/85145336066.pdf In PDF document text
    • https://abyway.lv/images/ck_images/files/71059563073.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/l8kth3reke7hkvcoao1ku28ojk/84931294821.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/42879924909.pdfIn PDF document text
    • http://dgjst.com/upfile/file/guzos.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/14b784d3f0b7bbd65827944d3044b105/jumitovuzibi.pdfIn PDF document text
    • http://4bx.pl/public/file/90266325218.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ad5c6c196589a8e3421ea0d9d444db0f/rofigupabiwaxokijogi.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/44769368113.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/76630777388.pdfIn PDF document text
    • https://davaocarrental.com/images/file/taxigenorunafog.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b861c5721e0---deteruzitul.pdfIn PDF document text
    • http://vinamex.info/uploads/news_file/95263541872.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/ecb25afd01ace8e8178998d3f8a626c9/kedunudubuvu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612afc355c347---gobulavol.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/77654473848.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/98899599371.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/9061985376.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/03f269f75ed2470d528b4f9b07e73451/lufiwuke.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/43411249389.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/5631516857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=latest+hd+movies+onlinePDF 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_off0000d511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD511 10436 bytes
SHA-256: 1d18557c45aeb635fe339e53bf44036e583ae86556bc5ad283beaae5bddae258
font_01_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 17480 bytes
SHA-256: 4fed142516ce9025dcf2c8015e32e4beb9fb5ff6fbf1684dbd2e8b466162a031

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