Malicious PDF — malware analysis report

Static analysis result for SHA-256 eabf53b55e9d25f1…

MALICIOUS

PDF

86.6 KB Created: 2021-09-02 08:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95060226ee8925d4de026705e6bd2659 SHA-1: ba8334f07bcc2e3d8b725a57f608932657388a8b SHA-256: eabf53b55e9d25f1b4fb2f20731e967bcc8a85beb83c6144d99c878e40379599
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple compromised websites and other PDF files, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links on disposable hosting and compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cemb.ca/upload/editor/file/luzorepusesubix.pdf In PDF document text
    • https://lufty.cz/UserFiles/files/36925064681.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c39edf81107---sufizopelal.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1395743b5f---2101256867.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a8dc313af---vovatojefovarog.pdfIn PDF document text
    • http://kme-kme.cz/files/file/76368953110.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/3248474750.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/xujoz.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/t740eacdl28m5jpknt0095rp84/66379271706.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827b8f7e0d3---91793731980.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/1347143900.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160795919a1c34---60973838653.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/vf77oe51dc2htgta98uio9kjti/vemidotibe.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d751109ad8---raguteliwejapojun.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/16075007071.pdfIn PDF document text
    • http://zzweien.com/d/files/xezalu.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/vokibenasivunuxapajojetid.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/viwinuju.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/vabopubu.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/ef91cbbce7f97537b8d20895e9e256bd/tazejojekux.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/fd4926cbe8c290ada9d070c80c81f0c2/85468157573.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/zumedu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b00qj6sbakrtrs1nv4ba322hb4/64885046685.pdfIn PDF document text
    • http://fotossc.pl/_files/file/bexunakabedomaxoxubupax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=redis+cluster+consistent+hashingPDF 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_off0000ecc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 18228 bytes
SHA-256: 520163f18b3b20005229bb893c3982e17df8e1ffdf1d2c84577ae19e60e5eb1a
font_01_sfnt_off00011c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C25 10792 bytes
SHA-256: 787c872a1cf68fe074ecd5e339bc1280a8a289e895dc336687e79770a8ece120
font_02_sfnt_off000134b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1