Malicious PDF — malware analysis report

Static analysis result for SHA-256 0751528e9aff7775…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 07:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9ac1066d512a3324f91236c8be954a1a SHA-1: 6ba1c189470d3764cf3a6854d2a32119b9ba10f6 SHA-256: 0751528e9aff7775fafdf4b3b4979f9943c0b9dce49d67dc8519863bf459b8e0
164 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to compromised WordPress uploads and disposable hosting, combined with ClamAV detection as a phishing trojan, strongly indicates a malicious intent to trick users into downloading further malware. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dongphuchuytai.com/upload/files/gefenanomoziz.pdf In PDF document text
    • http://studiolegalebisantis.it/userfiles/files/wanujegizubojikukorir.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a9cde80736cb9edfae9f190872674261/46022862876.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/82723531020.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/15936059972.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/kawakeruwiziloja.pdfIn PDF document text
    • http://salespate.com/userfiles/file/86077145072.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/98103369756.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/56621310643.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-11/20210911084400295519.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/896ac2513c6235ffef30bf4cdb82525e/vozefabi.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb87669d6c---7297627891.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/2458078994.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/gepibuji.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/wozageweziro.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/12867829597.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/nopivonojumunepejomozido.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/73400439652.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf501e444---xaverero.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021090716310157269.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/tedirezawatuwakabunuze.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/a9b4999af85b9a97224ee4f90d534cda/bapirulipenafaxog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+apk+of+vidmatePDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/votilejarozewijakapu.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_off0000dd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 18056 bytes
SHA-256: 64894b6aed0a877f78f95f5e23a72ef24a8aca3e28f2815eb47fb3043568ff73
font_01_sfnt_off00010ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA6 10636 bytes
SHA-256: 5feadf28c2d022384241bf4480c569eac541905a3266b0319d91786acc342c68
font_02_sfnt_off00012401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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