Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c91408dc871919…

MALICIOUS

PDF

90.0 KB Created: 2021-09-08 02:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 13f267c213a3c0ac2dbdf523bd9f6c62 SHA-1: e0499907e96c545331f9567a6b4e2c38cd053afc SHA-256: 94c91408dc8719197336c8f5133f5ea22277c05b56bfc08f908c6d0a6ca77fa7
156 Risk Score

Malware Insights

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

The PDF contains a significant number of links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to obscure the ultimate destination. ClamAV and the ML classifier flagged this PDF as malicious, with the latter scoring it at 0.994. The presence of multiple PDF link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://healingtown.org/userData/board/file/lolutumapazo.pdf In PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/55239034925.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///gomodujuj.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/xapisizelazufene.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/nemepedogifagosupose.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/jinj4mh19ld3o17ggm83h4ceh5/4531796842.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/be9594b6c7f4c1cce4219cf0c207eba9/vofejupivaripe.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/zedur.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/jaruvowutomipe.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/jajomifepawalakakiva.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/85084051138.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/kasamurados.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/gisisod.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1f056783edbdf79aacc0eeadb148e735/11996021217.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/pik7f5e3gnb6no4gu1kaupmtv5/tuvasu.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/suxejusevigeme.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1b29c0ae3596fa2fde6219951b531dea/28109635268.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/71849399449.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/nemak.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/790f50fab0d40e68bd350b019a31f85b/89253603187.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607decfbe97b8---xurixebupi.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/pcdqc9snrs6m224iei7g30ejm0/sugegojorazutukotu.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/noganefaxagedarawuga.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/2255e5f4592664233e427ad18a480b5b/nokaxogenobifire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+iliad+pdf+robert+faglesPDF 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_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 19116 bytes
SHA-256: bce82660859bd96f75b9e869709974691baa2c70c5c4ee0a0985ce4b704ae7e9
font_01_sfnt_off00012a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4A 10776 bytes
SHA-256: 152352dbc5dfcd33f32cff910423af0a1ce742e6befb8ea8e7e8ad120a99fe0b
font_02_sfnt_off000142ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1