Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e70741799a30f3…

MALICIOUS

PDF

81.9 KB Created: 2021-10-07 13:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4c4ace4043e236ca5ce643f777a9b912 SHA-1: 0655eb0259d02b54e147c43106183c288687f661 SHA-256: b5e70741799a30f30811a608c37dca37a1af5051b087b04ca09f99e4cb2af9b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, potentially exploiting them via a drive-by download or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://graveyards-fuj.ae/userfiles/files/24126873069.pdf In PDF document text
    • http://serdceprirody.ru/userfiles/file/43208360297.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/fiwolidonenevemota.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/50479442063.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/38594057938.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/42052541386.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/nufidapowajamus.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/85889693120.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/suramerozifisoba.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/koguwipikulibew.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/nopatogaxenufibukajidi.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161479600ea945---pulevekadubimonakuga.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399736c11e3---bitenamova.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/88153601410.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156455ec02d3---28389440454.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/91048192268.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613284412214a---56185819846.pdfIn PDF document text
    • http://safetruck.gr/images/file/jurizaxebikilebukolem.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/datosawibirepipufadiwezer.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/taleruxurejutikinupadoku.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/tematulavofujovogesidorig.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/dpbth4t3idspb9tkeb15aqn9rr/bejubusaxujobogiminigipot.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/71431345782.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/wutadikinejibiziw.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/97789767374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=probability+and+statistics+for+engineering+and+the+sciences+7th+edition+solution+manual+pdfPDF 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_off0000d595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD595 18932 bytes
SHA-256: 99180977728a01f5ece75bd219ce320b520aa7ef476f70dd28dd319165198479
font_01_sfnt_off0001063a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 11472 bytes
SHA-256: b0e18d1a051274cbc9e20a1699673f3e8e41079cb7b05ed4d2d9f9d4adb8afea
font_02_sfnt_off000120d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1