Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac235cbe2050ac9…

MALICIOUS

PDF

85.5 KB Created: 2021-09-15 17:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72896f84d0dcb7ded2551020c33867fa SHA-1: 9e87aed70b4a0a69eb4a899148268644f5a3fb4c SHA-256: aac235cbe2050ac90f59870c441e65992effeab133d3137239e7cb873761615b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The embedded JavaScript could be used to facilitate these actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=best+online+multiplayer+survival+games+for+android PDF link annotation
    • http://langmoon.jp/js/upload/files/xejamesixokarimifepap.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/79877218541.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/65214257591.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/56ad529ce2f54828be03f1b905a84cd0/68853791734.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612edf613864d---zoxab.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/goketi.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/mamuwito.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/92685433472.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/desejen.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/rajelag.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d029c7eb7---pogakax.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/kedulekewadapilo.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/1d34dfb136443c9360b8dce8ea2b7bcc/zirekakewisefipojumofafab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd8f97c085---8075049923.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/jivupozudizo.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/tarigota.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/98143823220.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ea318efa3326ed7213764b3dac3bdfde/totinelafapagefebe.pdfIn PDF document text
    • http://imotrading.com/images/userfiles/67146987730.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/nozazinazu.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/xurelafurasuzumofifex.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161364638a69be---88422623451.pdfIn PDF document text
    • http://orthodoxnews.us/file/rusumuretezomow.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_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 17872 bytes
SHA-256: 73f3fa20d814d8a8ba0a90b9c891e5e09722e1b64e91ca7d58c23b10fe41f389
font_01_sfnt_off0001163d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 11176 bytes
SHA-256: 1bfe7fa7f40823f8116212aab5d26f3399aa7b030d5e7964d3c6c046bfd79997
font_02_sfnt_off0001303b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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