Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0d5254f922a297c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 09:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e37989ea39e2f558ac0242139e288310 SHA-1: 9aefbddb407e835e6e3e0a10bf7fa77ed3fd9c08 SHA-256: e0d5254f922a297caaa632d85c9833c46e704b66f302b14e06a2126c7bb4383c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The sample leverages link farms on disposable hosting and compromised CMS uploads to obscure the final destination, likely a phishing page or a second-stage malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crewmak.ru/uplcv?utm_term=amortization+table+calculator+with+extra+payments PDF link annotation
    • http://pitin-akutsu.com/js/upload/files/paferidavow.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/52399021809.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d5f966effefb4901a86b76380e379aa5/62811070652.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/vururedewabuwakefusive.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/11884788210.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/3f41adf641099e348455406628f64071/56246050198.pdfIn PDF document text
    • https://drsaman.com/files/64955512989.pdfIn PDF document text
    • http://huefpdf.org/upload/file/vemijepilulijovekoxew.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085517f12878---pizina.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4db1c16ca---fupupagu.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/zonizeruxow.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210609004510.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/temilikikup.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/deninikide.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b27152e92---32061254700.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/ponebafokorujuxe.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb06cdb19---89749073042.pdfIn PDF document text
    • http://caythuocnam.org/images/files/mebosujufiza.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/mikujujedomamuxuse.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/juzodabumexujoluxoxisera.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/setaloxakosor.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/kiter.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607919e6a15f4---78350085337.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/64942891564.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_off0000ddc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC9 17552 bytes
SHA-256: 66060f1d3aa21ea3ec65c67f04907149f507d6124a6e390418cf04f7542c334a
font_01_sfnt_off00010b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8A 11224 bytes
SHA-256: 838183f1ea11e1548fc4959ad2b9553b4541bf3388e0fdfc0bb20e6688c88934
font_02_sfnt_off00012592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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