Malicious PDF — malware analysis report

Static analysis result for SHA-256 9441a95d26fef707…

MALICIOUS

PDF

88.6 KB Created: 2021-06-29 13:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05a9c3a0af685a9046badbfb8429a692 SHA-1: f59fa14929a3f15ec44ae098e29e6ed0e1aafca7 SHA-256: 9441a95d26fef707a8ce73fed40fb7cd11aabef3edcbb8e4afb05da45c3c5dd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://hutergroup.de/userfiles/file/xoxobubowufonujusi.pdf In PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/fkqjju93qh20i0u053fbe63hj1/49741926591.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/89783edf3e7a0a25fd48ae0bd2523de3/19793538087.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/81420141222.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/64b888ac18758e03c05db92cf9d87f3a/55812824614.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/regilivarewabigixuge.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d40bfedf7e2---vimopox.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/71282539763.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/toxupudamosafokenajudata.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/ccu5ae7a8vtr5cfkhokhcnfmh0/junatajasusarodade.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/murejoko.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/adfcd608f6aa2133ed897a70a7b90bcb/33323929404.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/24a6ba0b3aec5f9965daa10d56f65772/depunibitodibobigeje.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e83bbb50f5---10900660344.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd75fe46b6---mijebijibanedu.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa6e88363---27166127660.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/de7910b80c57b650c12d8a6972c2b1e3/noguparuv.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6088b177---mefesixilozox.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/luxuxobomalanewibalaw.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/g29jtj0tmbn212anob19dajjpv/24178533759.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/11801051511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sell+tickets+last+minutePDF 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_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 17648 bytes
SHA-256: 18df991b07d5864e12114b1d6a9198d4a5e9dfd263d4518e0619023201d1b71a
font_02_sfnt_off00013dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBC 10440 bytes
SHA-256: 6ac35099aa2eadf9d65e19ff19115ad8575e6fb6ac6f19f8fd66066f96e2ef62

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