Malicious PDF — malware analysis report

Static analysis result for SHA-256 282110d3afda3082…

MALICIOUS

PDF

87.5 KB Created: 2021-08-22 01:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08f385ed55a7e615217bcdd38cdce8db SHA-1: 10b4977178ac1c3c3151b0b29e7a3bd5707b572b SHA-256: 282110d3afda3082069ff93ce78e893c9450bdef105b52480e6f7175b748792b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting. The presence of PDF_JS and PDF_RANDOM_URL_LINK heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a malicious intent to deliver a payload or phish the user. The embedded JavaScript is likely responsible for initiating the download or redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=bmat+test+pdf PDF link annotation
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3958eb373---wimenazuwivabusu.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/74498730727.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/datiduxanifuvop.pdfIn PDF document text
    • https://makenie.com/upload/files/59186467652.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210802_0E16AF9FD821C9D5.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/5db60b4e21d3712531b081127f4c220d/xanemujeri.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160940177bcfbf---8666396309.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/zitetabonoterojaxodori.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/d498f91c9a205fec9ade469ebe87cbfe/24449063942.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c973b89b4f4---rusobufe.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/00a82858275719644da2c607cf2b3d2e/26172718438.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/merototavamitupowinerunu.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5903583a40---53045837523.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/jupejibepo.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/49928908419.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44dbd9af56---50011768998.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/94585082220.pdfIn PDF document text
    • http://atek-ent.com/upload/file/futuxuxeged.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf3664070e---43973207361.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/98949436801.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/vajapavumudape.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/97eba21e760f91df993a695eacb5598a/80436748492.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077639adadb5---89190753981.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c46ad53fc54---80144966285.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_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 17636 bytes
SHA-256: 706761462e292ac56019d51fc0f681b49f6e5960dc0312d90a9c0f981d787f56
font_01_sfnt_off000120c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DE 10248 bytes
SHA-256: 71a3e989e15da1d0383bc0375a80baeb5ff02e1033a09544dcfcf20c5da453f3

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