Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ab685fe63a44ac…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 01:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a22a2c1840be8c191b4a6409dc0da67 SHA-1: c786cdf479f8dca8e0bea71398a497fb6d9938fb SHA-256: 32ab685fe63a44aca4a1018936499e3482406c1c1ced9016025ec7104961a65e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised CMS uploads or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary goal seems to be redirecting users through these links, potentially to a second-stage payload or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://alvit-bk.ru/userfiles/file/9039338016.pdf In PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/95k0onfl56lsbcmmun9kh8amcc/bamerinivomumut.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130d08e3efc2---bupatulaginuxodifo.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/gukitalelunexirixominav.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/43856178534.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/meroxevegibise.pdfIn PDF document text
    • http://soc-in.com/data/media/files/86884089891.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/99298042430.pdfIn PDF document text
    • https://krossi.ru/images/content/files/lagevowezijifapiwujudutu.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/87684117373.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/keradudabafaloji.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/28415671193.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/13327907775.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/36435383079.pdfIn PDF document text
    • http://hejia-ele.net/upload/67304894349.pdfIn PDF document text
    • http://boldogelet.hu/media/roves.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/80721991284.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161421f2e80ece---xelakozi.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/76609015453.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/88426334705.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/37462399269.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/be3e5547cb629724b8ff3d03b74c8826/kumuxelatus.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/61492633357.pdfIn PDF document text
    • http://cx-gl.hu/images/files/vemumawave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ben+10+cosmic+destruction+ppsspp+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_off0000b513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB513 11088 bytes
SHA-256: e5b1576ae28197a6bf13ba920415c91a427ee561980c4bb0de035335efb5501d
font_01_sfnt_off0000cf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF00 17240 bytes
SHA-256: 16394fc969c9fb9035ecbe913beb4ccafca12e66f5ebed5aa3351f738dbc6ad8
font_02_sfnt_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1