Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c7db154c274827…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 21:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48b5fa50f370c9448925a78ed2d28867 SHA-1: 04728f321f5dd1868bfec1a1e44ad4e6c15b3705 SHA-256: a0c7db154c27482737ffd4896592c933ebe49359f72b564278ed6abf5bd40b7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to what appear to be compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=2020+friv+games
    • https://insinkerator.us/images/uploaded/file/wuwavobejobugelot.pdf
    • http://gustosandvic.com/ckfinder/userfiles/files/77628340947.pdf
    • http://portamarioarchitetto.eu/userfiles/files/jegelunagemonajadoxil.pdf
    • http://titadoorbinhduong.com/upload/files/99367737035.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/50lrcbk8suqmad5j89rsko4lpk/davotavowepovar.pdf
    • http://indexone.ru/upload/file/bururafuriwedukozitatapu.pdf
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/rinufavavoliluvipovariti.pdf
    • http://onlinecommerce.bg/uploads/pages/files/4378585305.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/8sbojar56qgngbdsar0qm9t3g7/rubadafaxik.pdf
    • http://alatasfilms.gr/ILC/img/file/69544200696.pdf
    • http://studioarclab.eu/userfiles/files/24844579112.pdf
    • http://fjzy18.com/image/uload/files/74023064905.pdf
    • http://seattledesis.com/fckeditor/file/lixalikeriseku.pdf
    • http://parquet-cortes.fr/data/Files/1052392203.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/be84b8c3f6f50be5439005d7f7c2adf5/likafonibovi.pdf
    • http://anadolumatbaa42.com/genelresimler/file/zezivojarinepane.pdf
    • https://innovativallatgyogyszer.hu/fileok/file/80283713207.pdf
    • http://yesfabric.com/images/upload/File/25481976313.pdf
    • http://globomax.eu/userfiles/file/xesavojupukiva.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9319aa8b3---21483879536.pdf
    • http://noithatlekhanh.com/Images_upload/files/finojeno.pdf
    • http://labsshop.com/d/files/46896238853.pdf
    • https://jkmart.net/FCKFiles/File/61748069269.pdf
    • http://wildpflanzen-planung.de/file/24400964479.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccb6.bin
a500a9677662f3e8e9c44befb70a9b914065bcc26defe30934bbd987a537e6fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB6 10400 bytes
font_01_sfnt_off0000e45a.bin
d6fe1e34d69be3b4dcf4a96d0b9f884e0b964813e71d8c8b4804bb0b8db19d4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 17452 bytes
font_02_sfnt_off00011148.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11148 16792 bytes