Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4755d7fb2810df…

MALICIOUS

PDF

105.0 KB Created: 2021-08-01 21:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 670c0aa2d40cdf9926a9cda1613c92be SHA-1: 1dd962e098871cdef0165e9ef01b2a2251bbb058 SHA-256: 1a4755d7fb2810df451947849fa604203973e68abb11922773aeb08d0d7fec1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of a link farm and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://temple.mo/userfiles/file/dezijevetedulodosififuviv.pdf In PDF document text
    • https://rajaunited.com/contents//files/watebad.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1625245954620115507.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0k578qcu8uju3ki3fkuqhpv5aq/99606468912.pdfIn PDF document text
    • https://jjpremiers.com/files/23854934987.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/kexigafenodivuxawaxala.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/95054305450.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/woxubeja.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/tureguluporutuf.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/am0u5cbbr0benr3pmm5uge1mfq/77981717997.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/t5df6qiegchtgqbpo80gjcdbm6/vorovimexobemewelarazol.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/97896164397.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/84660664300.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/10457719140.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/75923142160.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082f727c37b2---4119071562.pdfIn PDF document text
    • http://dzbnf.com/upload/file///26372413720.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c35cdc9484d---9747811825.pdfIn PDF document text
    • https://austarpharma.com/upload/files/wegugegewalap.pdfIn PDF document text
    • http://espokebar.com/uploads/files/kagelapoke.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/nunogapogub.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7ae892377---62801222164.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/gebawejebaxewid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=nsw+licence+renewal+medical+formPDF 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_off00013792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13792 10604 bytes
SHA-256: f4a4a89c6ee190701e5be6b2a584c981a62d1e46f683038c62766e94244eeb39
font_01_sfnt_off00014fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000167e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167E3 17340 bytes
SHA-256: b3128c8fc97c3bd77f7b3aea669d6cef2f9606801f2e3e626f9b29380745610c