Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cc4b721f960ee7…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 14:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4bbe18ab05753ac8ce4467069e18f6a3 SHA-1: 45cc158d1ea8ae6258bd047b484adaffb0b21977 SHA-256: d5cc4b721f960ee78e488cf010839239e46acbfef037fcdbadcb3361f0dc6ef7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The embedded JavaScript likely facilitates the redirection or further malicious activity initiated by visiting these URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=governor+of+poker+3+apk+unlimited+money PDF link annotation
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/purukejedavetukokixap.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/3000152897.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/78868844396.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e966eaf9863027c25ac28b248adace45/93970321446.pdfIn PDF document text
    • http://master-br.ru/img/file/gotitekate.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/14748938015.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf13c9d81---vuxakofuv.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/zinavuvojakugo.pdfIn PDF document text
    • http://ilovestory.com/upload/file/78650891619.pdfIn PDF document text
    • https://metagrhyd.com/infopub/pub/file/88551539904.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/nozovuwolukopotigoki.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/xagukokuxupupox.pdfIn PDF document text
    • https://henuopack.com/d/files/58536816678.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/tevukuvenurizizisu.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/97459966470.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/61178095993.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/tofepufumelema.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/55ec45c508db1c643d3a22f7e100649b/12944020182.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/45039524723.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/gifexevag.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/zepekoreziwexogewuwijasef.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74011862129.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613efc090bb38---59380814732.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61733318841.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_off0000b3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AD 16460 bytes
SHA-256: 8dde783719474772cd698422379f3dd2f90fb8f388d4ad4bcf63491c21ca62a5
font_01_sfnt_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 11076 bytes
SHA-256: e7b3746b5dfaf51f7252552014d9c7d07498c3c45234b85bbe1a21654e6e460e
font_02_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1