Malicious PDF — malware analysis report

Static analysis result for SHA-256 0956985d5d23cf5c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 15:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e8ee22123ecc6a49fbc17c46d5295c0 SHA-1: 30d8e383aac437ce15fe55849c8df9b236d40b7a SHA-256: 0956985d5d23cf5c2f79b57a0320a7eec7d443e540ca3a61d977ee45d22fe645
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5678dd8cac64eef3d125298be729e5da/61719855183.pdf In PDF document text
    • http://tccsrl.org/userfiles/files/6964999069.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b142e9537---16540558690.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/sajezebevemefovibileg.pdfIn PDF document text
    • http://handgun.ee/media/file/nuxuxeni.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/70422627995.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/89290648621.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/kiwaranolekisewap.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/bavesetetiliwizaratizup.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e306188861---47286352317.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/73376475422.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/giwabolororatozotibi.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210907155052145.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/56344781051.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/92222331253.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/koratufesip.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384a3095d4a---56971854198.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/79726482481.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/16426592328.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/nuxurufuzun.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/kebenamomofeveresojapuva.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/sorotirojejaniwalotiwolux.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/wuvenexuvejanorutokegivew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tomb+raider+2+cheats+androidPDF 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_off0000dccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCC 10812 bytes
SHA-256: 3cffbfb2744d740fa1af071ee7d8a2c2b19e6c5c5fce38253988eb98b4c54f72
font_01_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 19176 bytes
SHA-256: 4092dd9944e2e41b757c0b784a58e2257c9533929d2f0752885ea2fb479d0f0c
font_02_sfnt_off000126aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1