Malicious PDF — malware analysis report

Static analysis result for SHA-256 2510bef3b31e8090…

MALICIOUS

PDF

86.7 KB Created: 2021-08-13 10:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a7dfed0fffa571c82152ea72b46fa0ed SHA-1: 1ce413317eb2719f2e9b825a5eec45804b83dbe2 SHA-256: 2510bef3b31e8090bf1102c4975a6a1ec18a090360160757aa051823a15ebaf5
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. The heuristics reveal it functions as a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6d50c6fbb619087c45241d9ceafd7f51/34051303381.pdf In PDF document text
    • https://alutat.com/data/file/50294243111.pdfIn PDF document text
    • http://ezibra.pl/upload//file/98706251293.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/legasobi.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/5e9c0f20ed248fc6a2c79b04e48ecebf/98283781603.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/4buaijf67gsjl8dkghvvd0d1nb/19646927586.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/fetijuziviwalotexamodomis.pdfIn PDF document text
    • https://chptravel.ir/data/file/68720962930.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/66764042459.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3551e54517---85061175757.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/sugaxamulujor.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6p9a90huiocgthpdmuk8jas0hl/33528816695.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9ab28ab8a---70797303920.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/fb803c83cfb22ede67a80ba0ed85aacc/zajoputiwelejidenojuvi.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/fa8bda0cbd0fba664ab4d1ebe83ace5c/96730763261.pdfIn PDF document text
    • http://abpaluso.com/upload/file/vowazipixamigof.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/40210030304.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb33f12e5---sujerobizopu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c5e12d4d8c453d442d6ee2f85c46bdc5/nolamepabakipafijozivu.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/vejiwigi.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/58948089778.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/76758491301.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6b536b2b4c76a00c9b77f2a1a39e7786/43573132653.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/65c06bd3ae1d9faf1fd5753c228c3e6d/jozuto.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/59547692325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=guide+for+dude+theft+wars+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B8%D0%B3%D1%80%D1%83PDF 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_off0000dff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 22340 bytes
SHA-256: cea592055a63654e51aff551fd221270139d87cf9b0d48ce677818f562acfd96
font_02_sfnt_off00012f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F77 11568 bytes
SHA-256: 49f3d8896faf669526516e7256a461322bf87a2271ac2b1348262ef4546832c8