Malicious PDF — malware analysis report

Static analysis result for SHA-256 65831e00665d00eb…

MALICIOUS

PDF

76.5 KB Created: 2021-09-18 19:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75c0e0024f630df05efbfa187ce328e6 SHA-1: 586ad4558362bfb28e1c0bde55689f728fd5969c SHA-256: 65831e00665d00ebb93ce1311f84c9121f55fadb0e0254f846c8e740aac101f2
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a primary mechanism for executing malicious actions, such as redirecting the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 9

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=heroes+rising+dub+free PDF link annotation
    • http://oprandi.it/userfiles/files/topiserulopos.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/bilezapabesebaboged.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/moluvigesivumoroluxaremo.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/wolefi.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/45070429300.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/269ef28d0c368fa7422c626849107be5/xojutu.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/81851885202.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/73424074058.pdfIn PDF document text
    • http://jinyezi.cn/upload/40432539685.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/69088257003.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3adac7924b6fd3f7fb7a3cbdca14f6a4/51611671858.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/19770538156.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/litivisabinirasadizawax.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c386a0b1ab---61311875899.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/zejasesiguwebutifixopub.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a44f53041---vedilok.pdfIn PDF document text
    • http://schubert-hh.de/image/file/30845124566.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/vipofafuluruximatojoru.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/20515646949.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/babiwuvuzaxisawigedum.pdfIn PDF document text
    • http://villkasz.hu/editor_up/redumowibalaxuge.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/91745680956.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/12010845794.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/5728066130.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210916062945.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/mejunatorapimumog.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_off0000c2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD6 18880 bytes
SHA-256: b61e08fe12de3f70e59d181a5caad4726e23c5f4727588641d5c90149d29e204
font_02_sfnt_off00010cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 10456 bytes
SHA-256: 8ecc2a7020d42d4ea19a87219d8ab86a2b9143a2782c955e2e8e639ea8033394

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