Malicious PDF — malware analysis report

Static analysis result for SHA-256 c492ffeb2d796f2b…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 08:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57ea6bad88cf5ca763005d13b09958ce SHA-1: 7ee9418a68ca4bd1ea91e085b876972d7309a746 SHA-256: c492ffeb2d796f2bd47e3ad5cca9074d911c4751c6638a36eccb0c4bd69c7500
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads. The presence of 'utm_term=download' in one URL suggests a lure to download further content. The file's structure and the numerous external links indicate an attempt to redirect users to malicious sites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://huntic.ru/uplcv?utm_term=download+we+2012 PDF link annotation
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/jotepakalutegudibimexe.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/20073236548.pdfIn PDF document text
    • http://kisito.com/userfiles/file/wowebaramokiritovexovi.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/foponogabari.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/24029923991.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/jenedukof.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/69047455237.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b32d07d2cf337b2b8b5213ee55b102d4/13012302955.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16177443872.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/15067097085.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/laburedir.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161356f503cdb6---62942918556.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/posoxi.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/40054670255.pdfIn PDF document text
    • http://tano-cable.com/d/files/todewuzilasusumepu.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/50415cd96767970eb7d9919cc9bea0e6/kitinofaduvenoruki.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a966af4a1c1760b391ab2f1f5f5d2f9a/94222893625.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/fazud.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/57048313759.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/56609196403.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/39594174798.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/zaxonimexinibigiwog.pdfIn PDF document text
    • http://idroter.org/userfiles/files/33194484507.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/84285341738.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/zomawonesetovuwir.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/sojuvajobofijoxo.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/19e74abb70bb8c05f439bc3abd15e1f7/dilazirunejegaradaruf.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_off0000c327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC327 10164 bytes
SHA-256: f61c09094589fc37d73c1bf21314f288e278652a5b404b7751f4cf30d6830708
font_01_sfnt_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 16444 bytes
SHA-256: b599b33b81ca9bb7b3bd39c4fbafd629e0fe5a651869459b03143fded2da2618
font_02_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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