Malicious PDF — malware analysis report

Static analysis result for SHA-256 791a932da32c065f…

MALICIOUS

PDF

85.9 KB Created: 2021-08-18 16:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da208723a10827fb25261db4a72a0d32 SHA-1: 4dd57e34d8a82b90bdae47d29f3b8571353fe863 SHA-256: 791a932da32c065f67c2ad7fe02d28d94527adc672a36906d6f319c19fafd257
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm, potentially used for SEO manipulation or to distribute malicious payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, with the latter identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gites-les-bardots.com/userfiles/file/fimakojigofivadalonovekoz.pdf In PDF document text
    • https://lod.la/images/news/file/76356241175.pdfIn PDF document text
    • http://takeacode.com/user/d41d8cd98f00b204e9800998ecf8427e/file/foloxibafexoxipufaf.pdfIn PDF document text
    • http://starringthestricklers.com/clients/2/2b/2b6f34f03d9ccbd43d04a050b3ab825e/File/66825355953.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56ed82867---35783012049.pdfIn PDF document text
    • http://zuche0551.com/upload/file/finofirobadu.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/11214846251.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/xejokepuzizakimom.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/9685d10340e5822e0f2214b87c3dc9b1/totoxusiw.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/426826500.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/gukona.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16081b21263aee---puxudivujusesinawi.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/60704766786.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/76519822070.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/64233511057.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/kojamel.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d82de9b3---buxorowanupironekug.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/80d7321275a9bc0e9e38891528b75aec/demofu.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/03a2fa811fd7293c1cef15c9fcd0941b/gulikudomar.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/9309183487.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/6893888587.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210814/files/20210814000201.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c380dd3f5f6ccd76257a2921f5b93fd1/zobemasamasikakugumerupos.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113e33cc86f6---kobovoxubopixikobizelebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=krunker+io+hack+script+tampermonkey+2021PDF 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_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 19296 bytes
SHA-256: c5c62c4f05130c600871d6ce77f73417519dee3ed41def85929ef63c747dccee
font_01_sfnt_off00011609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11609 11184 bytes
SHA-256: 4fa688b380efe7e7eb8f6e9d8321d851461f5422ee7b896ca45699fd31770781
font_02_sfnt_off0001302b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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