Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d10f25cb2df6f0…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 05:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3ae5eeadd2eddb0e2510c5c89768eaa SHA-1: 9a2049a07d008fc089850326957c8d933ec83f56 SHA-256: f0d10f25cb2df6f0c0d62bbd5612107f30da138d7f282e7bc1822474ee697423
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to PDF files hosted on compromised websites. The presence of multiple unknown PDF links suggests a phishing or malware distribution campaign. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9958c6e9e6---doxilazozonelogu.pdf In PDF document text
    • http://donghotam.com/luutru/files/wividuverevazowusorati.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ee9e6b6025f1cac1265189f044c25469/74561236843.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/37298974769.pdfIn PDF document text
    • http://redactron.com/userfiles/file/35694253569.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac20b3b0764---godokowurepeven.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/47131274804.pdfIn PDF document text
    • http://www.hcc-cpas.com/siteuploads/editorimg/file/zadisisonap.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/73fd32240b2478a5103bba6d9b22b356/jisopadezobawejum.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb0ead694d---71459861757.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccfb171afd---lijavaxikomimamuzopam.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/tewadofazasuzab.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/74813655411.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/vn9vov0148adjbskabj1ecnhsb/35356482855.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/i0odraqhc7q5fa4fnii9i79igg/94753681934.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/wudebuporulixavato.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/79574527885.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/biredikezetoxasepokipib.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f76b716ba---56930714597.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/006dc9f8d4809aae736b86a9a499d3f9/mafopikidinexofojojenoge.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0f420538e0edf48f545c7bf928ebc02b/tekovuxafigudawuv.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/hhqt7pslf5mojvhp01e4iqd3h6/30434023580.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/44958678408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=compare+and+contrast+plant+and+animal+cells+pdfPDF 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_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 16900 bytes
SHA-256: aa9d69745ca4e6057c6f061924ff998963ffbcae81a7da9109691f2be71cc6b8
font_01_sfnt_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B75 10812 bytes
SHA-256: 862ab956964d1afc00cbaf6f6871a290e362a6532e9d9d22af883f321cad8a7a

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