Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a3eea6be4154d1…

MALICIOUS

PDF

85.3 KB Created: 2021-07-07 03:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5820d72153f2b83ea6d37f5fd2f268a SHA-1: 83ae49f38b6270d568900dad18f8a9429097e382 SHA-256: 09a3eea6be4154d18ae16c76eba47fe5205816132f1743e3eb4aec40a1efb22d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a likely attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b32c0485466---35425799459.pdf
    • https://108pizza.pl/uploads/userfiles/files/papiv.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/13635005a2c1a8670b0e3d849d9a9187/zosozopaguwikedotufefen.pdf
    • http://codienlanhminhquang.com/upload/files/xasused.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743c33ce3b1---ribik.pdf
    • https://lescourailleurs.com/upload/editor/file/19195725854.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d15b2690e---soxonopudalafodipotogidi.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/46e2a46362e3f296007ac83941c7a519/vexogegoropor.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a863d2f3260---xesekel.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1208a8b197aea760b0d39467bc6b8bea/pubum.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/3327c7fb8726a55585b5607411ed7cb1/7935054541.pdf
    • http://tbff-bygg.se/img/files/lodize.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cb2337d8e---31564903340.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/g5kkrnjsbakb4fc3o4gibum5t3/likugopodebikovujivovesa.pdf
    • http://sllight.ru/design/img/upload/file/fizapozunepota.pdf
    • https://alshamiltrading.com/alshamilfiles/file/75930145617.pdf
    • http://3suntech.com/UploadFile/file/20210605024426979.pdf
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/wirozevitab.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076aeddcf267---komisatalubuga.pdf
    • https://autoradiator.mn/uploads/ckfinder/files/kipilebamixasujabonimev.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/37851437b8b542ead142366d41713eb0/83905349491.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160984ab38ea52---41953454987.pdf
    • http://sunjewelsonline.com/userfiles/file/50394990653.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f88e12f74---purexiragaxalijevuwemiki.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=unix+interview+questions+for+production+support
    • 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_off0000ea19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 16792 bytes
font_01_sfnt_off0001022b.bin
b372965ace004b75215baf6e0530e5a957457e1fc5bf052e252fe9ecb84c020a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 16956 bytes
font_02_sfnt_off00012e14.bin
ac657252419b186e1df6fca6b8fbd131b64724d65681a504ad56149b2b01fdb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E14 10912 bytes