Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3f0a5ff69ee4b5…

MALICIOUS

PDF

86.1 KB Created: 2021-07-05 03:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9d5478015520c7f8e9335cc09ac2164a SHA-1: 8a4c0e2c67f6f1c98968b6dcf6bb3a9637517004 SHA-256: 2a3f0a5ff69ee4b5ae1121f6639db62317befe2f83651996e48209e2cffb273d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=red+tonsils+and+uvula PDF link annotation
    • https://jotekonybakterium.hu/userfiles/files/69312589563.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/kewasejepejadifokosixeb.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8b16ea8e3---36300819672.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df5a884680a---555076259.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/sukewudoz.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093af5fe0f6e---jimaviwut.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/52ae807179b8cbb271a4661c8e264b33/raxeletaduvu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdb9c15150---96562405804.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/283790689.pdfIn PDF document text
    • https://qnzar.com/files/ponawabize.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c74a81242dc---89965465741.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94842de63---36466959200.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/tefoxafu.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/rmc8c5q3f8gjt6umvftt5cscum/58504227985.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/pumefebodaw.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/36585492499.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6abd63bb8---92116912674.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/dugumadaza.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7999fecdcf---bujikabiwub.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/kd36mk5h6empctpi6d9uf81slc/birut.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d2b9d60473f06bf4747df87c93d832db/vazigakana.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/99722266360.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9c865545b---xidusufiniv.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bb0c391b7---vevumejepazilaxeredufoker.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_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 10352 bytes
SHA-256: f929b0405a185536485be450b397e069222b48fea48a7a9d8ba2b5296900a2f7
font_01_sfnt_off00010953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12165 16284 bytes
SHA-256: 1b3f5bd86f71c828fcead6ababeeabe01521c2ed6e48fdea1839ef99498345a6

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