Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4343aab2973eb90…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 13:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6296d6017f768cc234e6bed1f2810e8 SHA-1: 304274f8e4dce5156ae5e75b213eb1ec88e9299a SHA-256: e4343aab2973eb90a2dc725db6eb780d6afa9d37ffd577541d28edb82e72abf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple compromised websites, likely intended to redirect users to download malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://coretry.ru/uplcv?utm_term=gta+samp+android+download+apk PDF link annotation
    • https://astoraccessories.com/uploads/ckfinder/files/10725904711.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/wopenunisikoz.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e310715902---sasumosalamebabosaxije.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/rugolawezawore.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/61900019675.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/bbae191fe9d2a7dd21601db20066a0cd/99475148736.pdfIn PDF document text
    • https://attack.lt/images/files/16821363887.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/98486479590.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/85335098647.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/xutelofazonifuditisew.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/43550826284.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/65806225754.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/fapeberufotawepiwu.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/90665146506.pdfIn PDF document text
    • http://tid.vn/upload/files/61712199643.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/27177381165.pdfIn PDF document text
    • https://pcetravel.com/files/file/71088040493.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/35803120238.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fedosagamedowutusexukixi.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/xebabuke.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/17904856971.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/51991118728.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd37d55dbe---79824200112.pdfIn PDF document text
    • http://jfe.hk/userfiles/vevawevozuvesurikexub.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/47238986378.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/tagedejofegojegemafifoti.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/61206511990.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_off0000b35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6E 15368 bytes
SHA-256: bf2b9bcd51090e5be784b150fd9ae3aea5923005e4972729691d3dd047a3a9dd
font_02_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 10640 bytes
SHA-256: 22515a647132e7a5b1c3eff0b4e2ddcb5b7df8b6fdacb46e85434d8fb06417dd