Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3be633adf3a9f0e…

MALICIOUS

PDF

89.1 KB Created: 2021-08-14 11:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fed1e505b6bd1f9d5070429db4f3bb4d SHA-1: 10d726118e08003e5ae8fe0906757886a1b0cf46 SHA-256: f3be633adf3a9f0eb9dd3c495533cfa2a5831d20c51590c355e7912e8b02fcc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phishing pages. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for PDF-based attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a69baea06---pozolexugosisewumi.pdf In PDF document text
    • https://www.roadsafetyrental.com.au/application/third_party/ckfinder/userfiles/files/62649984472.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/tiwowenaxax.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160df4eaf1bc4c---totemete.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/8ffc4ef533f91f91ec5f045b22f478b0/suwiwuwuxibegerezad.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/327582634.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210606065757.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/69d8ead3f283b165261451c0cdf3d521/39477336586.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/dfae3c030ace02c51182b665c2d79b0f/2899401839.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/kiguvezifafojuxixamekivul.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/2048208518.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/4151866390.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/15453989720.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b788e5132c1---67751052324.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/76348152638.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0531973932bdc0e9ca0bd6655f8f0531/beruda.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/33893092843.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/82168fb60aa59458e08fc5833155e2e4/nepapubazenififoj.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a3e744ea---71722612454.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cd42b803f8f6de03513917a45cce9ed3/jalilifen.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4385c8ee55dbbbfad0f7555f565fa4cb/14727987889.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea63b104dc---jinukijonutusajonesetunif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=who+moved+my+cheese+summary+in+hindiPDF 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_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 10764 bytes
SHA-256: 62700ade40d096a368e176c19fd326d7d75559057dec30a87e5c805a5f24d290
font_01_sfnt_off00010f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0F 17364 bytes
SHA-256: 3361b888cd6b96aa824e41bf2ddcfc9b8de070fa7d05b8b112e7497a8b6c83b3
font_02_sfnt_off00013c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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