Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e1a321bb2c5b7c…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 23:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67bfeb4e21fc77beb29fed045074cf48 SHA-1: 72113771c9052ace7ee3cf018dbeb6a4ab2df092 SHA-256: f0e1a321bb2c5b7c7384979021ef38b79186bc57ed565ebf4a3f26875bfda4bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous URLs pointing to compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a tactic of using link farms for distribution. The embedded JavaScript, while not directly executable without user interaction, is a common component in PDF-based malware delivery. The ClamAV detection further supports the malicious nature of the file.

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 http://kowel.com/ckfinder/userfiles/files/1631551680.pdf In PDF document text
    • https://5udua.com/contents/files/8406380619.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/42871309801.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210927015042.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614edba1bf042---78438513688.pdfIn PDF document text
    • http://expresskaliski.info/file/216892117.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/51203682977.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/jinomogokub.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210926022327.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23806323709.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210919181139.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3qel4j10rr7i7uqc69g7c7r4g6/modolejoj.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/zekuresedijovufig.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/14617785014.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/81160428834.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/886def9457d485b48caf9693d37a1e0a/fiwojareribaf.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/43b6c6bqbafimvppvjkfu6p94d/pumetatalabune.pdfIn PDF document text
    • http://santehnika34.ru/images/file/nevedakezilu.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/durebumalupoluvudagimon.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/78863868720.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/rukukuxobojo.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/javovafuwikularetaguworas.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/91132598457.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/12503958102.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/gemomeduxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gta+4+android+mod+apkPDF 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_off0000b3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C9 15280 bytes
SHA-256: 9f1e1dca6d3ca6c0c630000ae7db15607009ccc577cc3a84005db7636e48f276
font_01_sfnt_off0000da8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 10416 bytes
SHA-256: 8a5043153a48273b81dc77e740501096af9bab0b9ee74b6ad63c618cf8a67d2b
font_02_sfnt_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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