Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9640711aa2592a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-14 22:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54bbde14b6746d382e44560d709c1570 SHA-1: 8c87ff8b5c8946c26b14987e279408bc8b07116a SHA-256: 1e9640711aa2592aa9e3ea05bb7f88e4541cf4f8fd7b267d361e5ca8cd9b3178
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farms pointing to potentially compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM suggests an effort to create a deceptive web presence, likely to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://synerhu.ru/uplcv?utm_term=mega+miner+friv PDF link annotation
    • http://millionsdiscount.com/mo_images/files/fupagebaz.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/42780143882.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/53166035356.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d54882064---30307719974.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/7336419787.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/19534003723.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/9920802653.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/64245952135.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/rotokozupedu.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/85478705844.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/30025791425.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/96798238634.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/jelaxekejovagelakutizu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff3b3eda0---21539064342.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/matimedusokuvorukekomax.pdfIn PDF document text
    • https://huanghecables.com/d/files/towafar.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/lovotatuda.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/gojutamu.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/30712925223.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4567054d5da7d3d367d6e1b8a8b75e5e/41034219983.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/xaxanasisipefe.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/romisixegazarejuwusegap.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/83104083754.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/12934722076.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/dumatiminizogozotetosod.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/lukosowikovekolulixegolun.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_off0000bae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE1 16352 bytes
SHA-256: 999e9a0767eff0465539452d834e195fa16c492826b8cd2505a18b16db113415
font_01_sfnt_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 10184 bytes
SHA-256: 99efa5c12507990cf7a95064662b6215cc44765b8ecc0214d84dc73fa8dae610
font_02_sfnt_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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