Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aaa19a89fa9e6a3…

MALICIOUS

PDF

69.0 KB Created: 2021-10-04 03:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d46dc170cd33309da10760d96ec1edde SHA-1: a78e680b674a74082e80e85d09532ac5328fccc7 SHA-256: 6aaa19a89fa9e6a3c8d5c53e3e33c5512efa656f52a286762b92b04808aa9c85
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to domains that appear to be compromised or disposable, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5231

Heuristics 5

  • 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
  • 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://garglob.ru/uplcv?utm_term=agile+methodology+mcq+with+answers PDF link annotation
    • http://faurau.com/luodan/images/userfiles/file/42161416521.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/55860210780.pdfIn PDF document text
    • https://avela.md/userfiles/file/zizinukibozezol.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/zidulasipegasavuket.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/zojudedizesiwogam.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148130c035fc---ropekiki.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/534857bb17ff48119461d5d67a77d33e/fikukomuxogujufexavo.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/zutuvozoliduzas.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/84132642773.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/66014648861.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/91710636839.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021924820585472.pdfIn PDF document text
    • https://best-label.com/upload/files/ridatepivi.pdfIn PDF document text
    • http://devison-matras.com/upload/file/44072954409.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/suxabexul.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a65a4583f6f445fe2cc7b46725b0b7df/zujejibitarol.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/nonidimutamonukatobam.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/30434953747.pdfIn PDF document text
    • https://thehouseproduction.net/file/9877038763.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/lugudijirelanuketa.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/7d3d7a3c21894cc2932255cb3c57e116/wujesidipabalitaruvevepa.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/55638302660.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/57212891844.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/4785636508.pdfIn PDF document text
    • https://frenstravel.com/assets/ckfinder/userfiles/files/buwavefaselatusa.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC520 18296 bytes
SHA-256: 6232e1b0f867c70b1bd647d3f0dff1dea0ff02f8993a7521510ea9505154c851
font_01_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1