Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f104364d28b5bd…

MALICIOUS

PDF

83.9 KB Created: 2021-08-04 03:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 314c0bf7cc93601c61e64d0af28dc37f SHA-1: 00a88038870ccc6ea922fb07418d1eae5dbeddca SHA-256: b5f104364d28b5bd3537fd3c819f18591d5d50b5f324b6855bf919b61d2ed08c
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://aucoindeshalles.fr/menu/file/megetonileg.pdf In PDF document text
    • https://euro-commerce.bg/files/46357157916.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/raguxubobujulixog.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/81991924245.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/xififigirofagidogufakuw.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/203fb7b5c65fb0a8e9e1148926fd6c53/xijodoje.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608527413a4cb---zomitasamobul.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/1042073356.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/31212261764.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/48358499247.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/sidelekuzunonememokije.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/0b5e0ae19591f5ac489322aac1a59ec5/xipupapakadatijijofad.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a36bc0fc4714074f28eaa9ddd5816d88/34751806008.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16209669794576.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/776bhmnodgao11l67t6b6i440s/bilazugulitexugafo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160953673d9f44---45145621870.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/luruzadomexisixub.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/gomigoju.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f21059f3cc2fb72f0dc09b61652eb242/21194141754.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76ce1b7378---69883627290.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfee16ca13a---xoxepaxamopute.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/67782137989.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b0739bb1c39---97320116118.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/toguxewawusopidop.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/nanirunenosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=baahubali+2+tamil+movie+songs+free+downloadPDF 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_off0000e219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 11368 bytes
SHA-256: 1415c63a5637588e567b75fe09e1f99f753bd5d96af3bca09045046d68fa8375
font_01_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 17180 bytes
SHA-256: d2c9ea012279fe39858d062dc32cd1f0cd11f9b28c939e240b67e43e5b079e0e
font_02_sfnt_off00012940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1