Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c460b9b65235f50…

MALICIOUS

PDF

77.5 KB Created: 2021-09-06 04:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4fb767e5d45a30a90bd5ab796f4484e SHA-1: bc7f09657bf4dc76bec2a2a9566489bdbee5f4a7 SHA-256: 6c460b9b65235f5045fbcbf3cf14ff9a481d7da368f64bed0158fdb55a90d9e2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a strategy to distribute traffic and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/8c0m5nl3eb9sbne8nagi3j8s42/5808065772.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/divoxinijusekefijenod.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/cmbm0m7hua3lp3m52uosqk5vbn/29894159472.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/98092861043.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/27924953447.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/vanotedinixapemakob.pdfIn PDF document text
    • http://jsdarvin.com/files/38133962787.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/2b932cafe53bd1649799b569c2057698/62170476625.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9655b2e8e---72917391457.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4ef5345f130c99c102d680af30220a3/15706698799.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/e6ih46furb021hsb53d4pkfpp7/37122611590.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/44120fd01e878c7a1cc567679216502a/xumomigibatefafop.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/debazewikeju.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acad0f23ec6---34845481599.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/gufedaremavetovepokami.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/59906417228.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/38151304690.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/27878649976.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac86b5631---nituku.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/3rb66h7dotja6etjljs57tva3t/galoja.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/5005d3ae32e63fa92798aa3dc3be9f39/80622913747.pdfIn PDF document text
    • http://newo.ru/files/files/sogelavijijurazivumat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=one+step+equations+practice+worksheetPDF 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_off0000c8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AE 17948 bytes
SHA-256: a8780445027b0fc24736244f90c8dd4f0788a5fa09fb28eda668730f460935e8
font_01_sfnt_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 10876 bytes
SHA-256: 720df66fecf78911a5888b69a91b52ee78a8e33dfcbfc0644f33d62d2986da8a
font_02_sfnt_off00011026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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