Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb3d47f56c87d7b…

MALICIOUS

PDF

75.7 KB Created: 2021-08-08 01:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d72ec90f7989c722c8949a5f908e925 SHA-1: dc578530fb574ea0b84afd91e9802eccc5fd118f SHA-256: cbb3d47f56c87d7b7ede2e793a69052630b3dc03f46bf46d090235e959279f9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/4aff0fcc4e80334dca7ba9ffdd10d45b/putovitiv.pdf In PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/04ad4d4ad1694afdcd0c364fc62ccd97/71486800943.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/4111096621.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/7a49641d5286cdd622f9a3f2c2b1cbbc/pulefedijega.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f47891ba6---12547986275.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/robunidamigorojosi.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd73ad4705---lufalejosuwewol.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dfe5331b9---74834982714.pdfIn PDF document text
    • https://nevisnews.com/userfiles/82648799050.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a72cd5861dc---sepikukekefu.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/zexerigebojebogekumimos.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/muxowikumimuferus.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10940044069.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/hrhggc5lmciss8hf74m3tghrj2/xabewubutonuzizigofodenu.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5dfdeeffa840821ef667a9f351899b97/suvodesimebadidariko.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa5c06400---69175751805.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/wipolaruteduvinolakox.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021060815571473499.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/418f1ddb77b1aaaf2b02047295d7b8f8/puxebipatidageguridutuw.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/72271379854.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/49257957711.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210707_964737C774127412.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/006fcd9a3734e844dfd8548e05fba1ca/zovofivigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+know+what+size+kancan+jeans+to+getPDF 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_off0000c3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E9 16468 bytes
SHA-256: ce5b5371524d61f1e7cd4db438acd3797e8a470653c7b4b5a466de8c8d0f9411
font_01_sfnt_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 10720 bytes
SHA-256: e3884cd232f9ed774b14a2942100ddd36e2cbab9bdb427288da0bd85f3394a35
font_02_sfnt_off00010777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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