Malicious PDF — malware analysis report

Static analysis result for SHA-256 90385f8e7f8c10ae…

MALICIOUS

PDF

91.3 KB Created: 2021-10-20 01:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c940df78f7ca8b5e79864abf02a0eaa SHA-1: 7e44abd332580ee7a548f5639aa804ec31742b54 SHA-256: 90385f8e7f8c10ae526d9a18bdde9862c1b963b0ca6b3e87b4ff8e53dc14b4c2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised CMS uploads and disposable hosting. The heuristic 'PDF_RANDOM_URL_LINK' indicates a high likelihood of malicious intent, suggesting the embedded JavaScript likely attempts to download and execute a second-stage payload from one of these URLs. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://monyetjoget.com/contents/files/xonetizitap.pdf In PDF document text
    • http://autobedrijvenindex.nl/images/uploads/79948165614.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba3da3034f---bexepupabuwakixas.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4ca2204a1---38966771007.pdfIn PDF document text
    • https://ampayroll.buzyhub.com/files/2220403013.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/52919809484.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/tusadijoposakomi.pdfIn PDF document text
    • https://tcremich.lu/files/files/38315400544.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/dizip.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/36433741013.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/25314420069.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/92662175767.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/74134189593.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/pazowavedoximedazilopeje.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/72658574785.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/xesuvoretimirikexiwubol.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616f0890b2383---75299640962.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/53774896690.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/gogutadazas.pdfIn PDF document text
    • https://dalba.net/other_files/File/14597032214.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/bifupamisixurexasop.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16169e9a25d9ef---veludejinowelurixibata.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/kijibimijoro.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/9194782982.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BGAemAmcdTc/uplcv?utm_term=factorizar+diferencia+de+cuadrados+ejercicios+resueltosPDF 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_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 21448 bytes
SHA-256: ab765c2db7e719c6ee76c01aa475b2b19f23300b1aa2e6e6bc114515b65b3597
font_02_sfnt_off00014450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14450 10736 bytes
SHA-256: bbd6e95f8211222d18182646a564d7718991e87a8143b6db7b2fa2876cee08b4

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