Malicious PDF — malware analysis report

Static analysis result for SHA-256 020b98e84fe35c00…

MALICIOUS

PDF

94.7 KB Created: 2021-07-25 08:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eff6481861daf58d56da57977ed9fa57 SHA-1: 0922e03576566ee5179f7e3eb38cdce690f60424 SHA-256: 020b98e84fe35c00a2ad79c0706421a4af6a558113128bdafe7c1f3fca6b1d91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites and other disposable domains. This suggests an attempt to lure users to malicious content or to poison search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://tai-group.com/upload/files/kokufupotaxajenunuk.pdf In PDF document text
    • http://gocreate.termall.pl/upload/fck/file/pipubaruzanexupigapal.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/jemela.pdfIn PDF document text
    • http://myredm.ru/uploads/file/regawemudugidal.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/55519290745.pdfIn PDF document text
    • http://ghgunclub.com/clients/f/f3/f3036db30fa8ed97f94f648fc77c1040/File/tibasexunebulovowe.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/v4ptg13it9pf63ju0sbguhojb8/74231553189.pdfIn PDF document text
    • http://msiutilities.biz/documents/sonajijixiwobusakuto.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/gjobhavbhcslescntt8np62bgs/potoboto.pdfIn PDF document text
    • http://mousike.it/img_ins/files/rijugoxobagi.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/lesuzinu.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/tubizimenedelapafag.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210717125101842195g39ek0vo6d1o.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/a1741d313a4a9b5921fc32e25c88ebda/zatubiw.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1442663c46---welebipekiz.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/rukosozajodutimuletap.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a9915f1f---xekonegabovuxawa.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/62cc1bd17750801680e3fee1828014b8/vuluwukudikab.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/864a74a434242b3fab20e095c36a5484/piremararuto.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/gaxebalinopurazutar.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bd2cba10f---pivomu.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=istanbul+tatili+filmini+izlePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 10404 bytes
SHA-256: da96c1ecfbacf26adc1969621a1aa51dd1e38bce4b03c26241ee38e738005a9c
font_01_sfnt_off00010e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6F 19080 bytes
SHA-256: 9bfa46d006f5b65ca742ade3e2ffd5b6379413865e84b97e7ff9f141a78e55d9
font_02_sfnt_off00013c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C51 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00015196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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