Malicious PDF — malware analysis report

Static analysis result for SHA-256 18026cf133ba5a61…

MALICIOUS

PDF

108.6 KB Created: 2021-06-26 05:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6e9aba6a222a7f4fe203a9f4f2c24ca SHA-1: f0de561cd49fd195f84304661d95126cb761dc61 SHA-256: 18026cf133ba5a613de95c52f99b27ad9fa1d5762bdf5035d808ec6934f7e5a5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that likely lead to malicious content or phishing sites. The presence of multiple external URIs and a link farm on disposable hosting suggests an attempt to distribute malware or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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://catamma.ru/uplcv?utm_term=meaning+of+un+in+french
    • http://vdadanang.vn/app/webroot/assets/files/wiseretokinuwokureputi.pdf
    • http://lab4050.com/upload/editor/file/rezetigenijeka.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a368b8048f---76834833485.pdf
    • https://t2sc.me/userfiles/mugezapew.pdf
    • http://dighakanchaninternational.com/FCKeditor/file/xerega.pdf
    • http://begemot-rus.com/uploadfiles/file/2021060617451873499.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098c0cd06db8---wataxofivejapewuw.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/add32f07b910f3af7f3865f0368c6900/20330536569.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/56926857745.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1af0c6367---rakanapotegexune.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dc6c499d863b1095d1a688ce4473dc78/84770637894.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2m7irmv6pn247t57onr4ca58m0/labexoroxowevag.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6da96e1c61ac12fb500335b73b0f7cc3/68973690198.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ad147ab63---37923733227.pdf
    • https://universal4shipping.net/userfiles/file/85971212256.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa6799632d---75884162984.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/67hqmn5v8a57jcj889fv8493ae/93534453074.pdf
    • http://tai-yang.tw/taiyang/upload/file/41826314603.pdf
    • http://aven.su/userfiles/file/85660887919.pdf
    • https://stratasphere.online/userfiles/file/sipexajudabolugonegefije.pdf
    • http://dinskayarealty.ru/media/file/sigamikaxazenanuva.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac11ae6ccae---zikuwar.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/63d17bc704aa2f64a5fb9afda461cb2b/13404051572.pdf
    • http://humanitool.ru/userfiles/file/61356543074.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001153e.bin
f374be8deb4a92df7c82641d726cdf876a20fcae6afd20ba16c6b4ad525bfa08
pdf-font-stream PDF embedded font (sfnt) at offset 0x1153E 16316 bytes
font_01_sfnt_off00012b8d.bin
0eddd780c0b2cfc0d00ddbbad966568b10b5950f341d33ab30cad0ba603abb00
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8D 26356 bytes
font_02_sfnt_off00016a6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16A6D 16792 bytes
font_03_sfnt_off00018284.bin
2ad48b3359312bc5c6ce0d0930e9f83b37acd763ee939c71255bf469d17948ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x18284 10396 bytes
font_04_sfnt_off000199eb.bin
164fc3dda89fdf2e9954639791401acc76fc2ef6a5505de4a0ae2fda8f9baa85
pdf-font-stream PDF embedded font (sfnt) at offset 0x199EB 1844 bytes