Malicious PDF — malware analysis report

Static analysis result for SHA-256 883f6497c2eaa46c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 06:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8e94de83e154f9451b1c8782e3741109 SHA-1: 8a0b31d27a947f24be6e0c61487f80af4c6627c5 SHA-256: 883f6497c2eaa46cc697b809659f8abea2a3a5395ffb345a0c61dc5eb9f84b04
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://hamzakocakoglu.com/userfiles/file/kefodajufuto.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb3bf695ab---wulidafetinuxupinuneni.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/xisivogodux.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/jasemonorobosaragarowejam.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bb83d6c9e10---20793092302.pdfIn PDF document text
    • http://maidichike.com/upload/files/jogike.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e7ace9c68afedd974090a5482ea97dbb/fanas.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/zakanajowuxale.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160da5b95ce1f5---kituxuguzokemumed.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/23363674424.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/90192449068.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/3971495831.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/sokunex.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609449092f14b---34523313309.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7536366980---11233786004.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/xasef.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/29491713972.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/noburexuvirerivufo.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210830035116823567424.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48b112343c---13073878008.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/50145846104.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210704_105147.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088399bcbc5f---97316995352.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160745899494f8---jesilojoguximunigunegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=2010+ford+ranger+manual+transmissionPDF link annotation
    • 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_off0000d721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD721 18928 bytes
SHA-256: 1d9f46ad6be9a8304b0568e00586c05c32a3b925e7e35a95e7c9f53f5cb09d66
font_01_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 10992 bytes
SHA-256: dac8a93585928e038e8131be9795d8978094fb7d699cd7dbf159fd6190e2ed21

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