Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88c52b055852bb7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 22:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c1e973c134bc19b00166ca2de8bd8288 SHA-1: 0f7d1890de720e8ddbe4b57e1e8c977ce3172239 SHA-256: e88c52b055852bb7f5771dd73f5ee0a256e9bc20449776bb81309cef13193ef9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=truck+driver+3d+android PDF link annotation
    • https://lifetides.ca/cambridge/uploads/files/47223566607.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/lekavokapipa.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/93721254621.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/sutoroxuzipiwir.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/fojufe.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/porowur.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/tufageba.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/24578811312.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/vemofujotefuxekitilalak.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/19196577175.pdfIn PDF document text
    • https://goodline.by/userfiles/file/luvosarekijimulutes.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/fepupozirexisorujako.pdfIn PDF document text
    • http://khocabien.com/uploads/files/62930257418.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6770b6ff---wuwasodafaka.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/48391036865.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/65609941381.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/81677857497.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/88057710334.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/45816338089.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fda0aae965---22298613545.pdfIn PDF document text
    • http://contelex.it/userfiles/files/zuzisufe.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///35767756668.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/bobijusokaberesiket.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/xezarekuf.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae93107cc---mutis.pdfIn PDF document text
    • 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_off0000da56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA56 17000 bytes
SHA-256: dfa9c25cf02dde11d30016dbd5f1d7a2debc0fdf4aa55b39790b138ce285de49
font_01_sfnt_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 10444 bytes
SHA-256: d5eba5b92ec230252a25cc4169371928a9bd61880bf86a039650ecef29c41cf2
font_02_sfnt_off00011e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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