Malicious PDF — malware analysis report

Static analysis result for SHA-256 9733b2be1eaa4cf1…

MALICIOUS

PDF

75.4 KB Created: 2021-09-14 08:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b481659c9d60ec9b69e8b29797a1dcd SHA-1: f72fc191ae51f8f468e0f5bf8dadb8c515de6be5 SHA-256: 9733b2be1eaa4cf11ad36501aa35d7b567aaebc3e5dbd5be19812ee3fd28a332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the final malicious destination. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://vasantviharproperties.com/userfiles/file/44578182305.pdf In PDF document text
    • http://sheilahancock.net/blogfck/file/37600089951.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/jetegixusurisuvuf.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210903_F6690F5063DB6322.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0132b3bc874e1a57db95fff8a9f60977/rokukofabudaru.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/13202157377.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75a39e4a3---wenaxukufojodozo.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/mademedodufosulusubanib.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/gigutinu.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/ratoxuwedo.pdfIn PDF document text
    • http://annabarons.lv/files/files/55932820000.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/wegipizaj.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/60699834754.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7e67543cf---35471530611.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/86765506923.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/77417000104.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613416589c19d---66343047640.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/75968355008.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/65227474029.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/38483329043.pdfIn PDF document text
    • http://delve-cr.com/uploads/72994414569.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/75285385963.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/72277700017.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/46459767738.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/tamojut.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/1440932327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dc+legends+of+tomorrow+5+streamingPDF 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_off0000be8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8B 11040 bytes
SHA-256: 981988ad3e140e874d9fdc279c84e65d4f5a84140d1089adb4256ca6814534a6
font_01_sfnt_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 17524 bytes
SHA-256: 139628f80eed7bb631bc5ec9d09189427fd8b04eb6b2c5adcce21187dce6f999
font_02_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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