Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e403bd1d756d7f…

MALICIOUS

PDF

72.4 KB Created: 2021-09-07 09:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3e8c198b9f83b4be0f92140827d53645 SHA-1: 921532557f01536b0fcea172f63063e0166ebbb3 SHA-256: 15e403bd1d756d7f4e1bc45e79e6624018a95d115d4df1d2bd7abcf9cc5dc3ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that likely lead to phishing sites or malware downloads. The presence of external URI heuristics and compromised CMS upload links further supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=animals+worksheets+for+grade+4 PDF link annotation
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb94d91716---48874715096.pdfIn PDF document text
    • https://samowar.ch/upload/file/kunomanuf.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/tuxujuzuzaka.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/babadidigidirunarewuvij.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/43227190519.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5b0eb8797eee6793e31bd9dbad50d715/tizesuxufigolefirirajodox.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/94992533790.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5dbee9312f---juseguritiri.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/sinokuxizidobevavinixu.pdfIn PDF document text
    • http://riversedgefm.com/files/file/76515493615.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/83631062405.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b041812e1ccc617f45e76db84c223f94/ruragepobifutupokifow.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/k19uvs6c1v4i34quhef2t45l1h/58579681775.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/dilotosik.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/mibivokuwujewagofomisezok.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/lefavanonekurovuxupov.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/dovajaredigezu.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///90853154674.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/17011950026.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/topajudikotun.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/46644610034.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609777d6ed38a---lidafevase.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608654de8e2d5---medutebixajixox.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/bezebebateg.pdfIn PDF document text
    • http://hevolta.com/upload/file/sifofibik.pdfIn PDF document text
    • 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_off0000bb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB65 15224 bytes
SHA-256: 521ccc68c929371776505b219f68c7b7947602058a7e5a410e7ea7658477c992
font_01_sfnt_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 11040 bytes
SHA-256: 04736782749252167004a1ee4d7cb71321c2ff46eb1c75334cf00d863b0b11d7

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