Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e67f4e3e658282…

MALICIOUS

PDF

83.7 KB Created: 2021-08-19 03:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b053ab7b63f39ab1c9d9036a4096e54 SHA-1: 0d8d76b0cffff89e795521b0cb06b1b64a4f0557 SHA-256: e4e67f4e3e658282f699408a98f03760700ad25af7575161162881cba7b8c5af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on various domains, indicating a link farm designed to obscure the true malicious destination. Heuristics suggest this is a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and embedded links are indicative of malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://autosaloncenter.com/uploads/files/jepomozijak.pdf In PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/8790833753.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/lezaxoxovegotujobej.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/49755370328.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/6703443095.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/wuguzivadagebiwurovedidaf.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb8eb3d59---pidumutujowaxixemabapibar.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/59254062782.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/0571bcf0c2f8eb8e6838e0f3b5b64a3e/87499936268.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/98452221187.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/54869481018.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210707162568157266.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/bedemovaripuresofa.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/13512498420.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/24011964081.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/19607115598.pdfIn PDF document text
    • https://studiorampinelli.com/file/58984656566.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/vilib.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/47500165037.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/zubedinebowafadidoxikodo.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/fojewasezilelogaxulumo.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/2dc8c4b41c16a1416bc838b4ae46a875/72958783478.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/46305650581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=tarih+soru+bankas%C4%B1+pdf+indir+yksPDF 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_off0000dfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB6 18988 bytes
SHA-256: 577eb9e09db5af75e4b97d724f644a33edf90ec38cd3520aae8f187a8700e725
font_01_sfnt_off00010e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E12 10776 bytes
SHA-256: 483401459c3464de2a09857f93a8fdfec112859c486c902b54644c12018b8760
font_02_sfnt_off0001268a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1