Malicious PDF — malware analysis report

Static analysis result for SHA-256 d431711b7c84416b…

MALICIOUS

PDF

71.2 KB Created: 2021-10-01 08:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9ff867b1c2dd93f1996e082210b526a2 SHA-1: e771bf1f5498a41ced5b651705df4852c3f48c79 SHA-256: d431711b7c84416b4905e7a00e5493e3cb95febb471c3d52f64957f13cb08105
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the structure of the PDF point towards an attempt to redirect the user to malicious content, likely for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • 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 http://alothongtin.com/upload/FCK/file/zibijagilozamewas.pdf In PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/xogevejofivuko.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/kolizamujadoxa.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/xeruvadalijidozabafan.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/sadus.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/bosasakegisu.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/32360505342.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/tugudoge.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8aee26927e2a5a22648b22e55739ee44/viwoxide.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/mezaworibatu.pdfIn PDF document text
    • http://iccarrentals.com/files/file/rokewilalirozoze.pdfIn PDF document text
    • https://medius.sk/userfiles/file/kikavinanegik.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/pugasisutasujeripotogano.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/runafa.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/nenoneberekedude.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/zelajararetigomorubizubob.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/6190965473.pdfIn PDF document text
    • http://knipia.com/userfiles/file/34627672279.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/16419370632.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/gizeda.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdcc0aeab4---wumimuredagibekaxukuze.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/mutew.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/3c366f70084d2c16b1d1a01dd374374e/likadimus.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/nisolagemezuboladixeralal.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/17487619367.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/vexaxovugasiwigibosez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=quadratic+function+with+vertex+and+pointPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/boxedozifo.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_off0000b3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3ED 16156 bytes
SHA-256: 6697213f7dc73a0a75efb06a8024670ac8ff3be5b00435617f8b245039f8f291
font_01_sfnt_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 10916 bytes
SHA-256: 1a329f12c3a3e66c735c82dd5f4eef9cd992b5abd54f1588a3d5a1d57514566b
font_02_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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