Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4da7c9641e61a50…

MALICIOUS

PDF

79.2 KB Created: 2021-08-08 13:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4643b550115cc0295c9377c32dc23a25 SHA-1: f78d0f58d2c6f80b4e22a3042d5b6c9b63aec9c0 SHA-256: b4da7c9641e61a506055507d73d6705e95e3c974b16bdde86c16ff1ff9af201d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://incoyun.com/calisma2/files/uploads/12785975269.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1701aea546---rafotujumeguweter.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/dukuvad.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/bojilonajirufovi.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/jupudoj.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/cgaclbuqtkpk24aqs34bg0j7ni/zibigeku.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b115952e458---13681088439.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd5d3afdc9---36393937391.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/pitarutobisig.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/2304fd92c36018bc072ea72965489e6b/89990860403.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd96e09277e---70592293497.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/2rse9jkvrtend6df72dkqionc7/55339292871.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/pewaburofavavasesegadubes.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d65a8b6b7---50696678999.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/xuvikojup.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdcc86c381---verimusiwebamapotofodazuf.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/11258017518.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/nituzijif.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/25747714815.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/31649297814.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bur06urrlt57qncf3hkag1fdj0/65487481684.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/lemedazofofumiwofunonudev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+reset+code+on+chamberlain+garage+door+keypadPDF 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_off0000d000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 16056 bytes
SHA-256: 821aa9e3acc9a1853c2fbddad0eaecf620166a7ef4ead24609f5d236fdcfe5cb
font_02_sfnt_off000111a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 11384 bytes
SHA-256: 5e0f68c6637cdb25fbcd3031206f88401552c32730dc7dc6c48f896a74b11993

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