Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8fbf7f24d905c4…

MALICIOUS

PDF

86.5 KB Created: 2021-09-22 23:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2cddf2a6a1ed8e8f08ef63182e24159b SHA-1: ecaf024224b50f27ea021cb4aa5194a43330819a SHA-256: be8fbf7f24d905c4b298c0ef2131e1d64e6ad012dec3eb513a8ffdf1f09e99c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://pistant.ru/uplcv?utm_term=present+simple+present+continuous+present+perfect+past+simple+exercises PDF link annotation
    • http://gestaocipa.com/public_html/Imagens/file/24978010697.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/2167888333.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/97382066560.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/48065767228.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/pijosekowosezazed.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/48397076993.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/59450387022.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161470c275b213---84132634869.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/sugatopavedokipuvevo.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/wimopa.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/12314393295.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/81005044915.pdfIn PDF document text
    • https://digireg.dk/upload/24880342784.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/xiziwejuzikujesur.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/26978260073.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/birid.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/94998310043.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/88736260814.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kl0780kfuiapfukkfac7k47n20/wisujefolipepiv.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/59011490115.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/98840390986.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/nifilomawos.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/60941316406.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/14536537930.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6fbd86b632ddd2a8cefacafa57e7d0be/mopasejo.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/xezosebuvijuvebo.pdfIn PDF document text
    • 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_off0000e88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 10844 bytes
SHA-256: e87a9990c01f595ec0f1bb07a182ccc102d4734048892c3b19ca85d8ea176dc5
font_01_sfnt_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 19356 bytes
SHA-256: 10b7e7ce073f0563c0ae83b6d7d1effa1ed03ee296d88b2324085ebb5a5d0638
font_02_sfnt_off00013392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1