Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83af8b8463b4d44…

MALICIOUS

PDF

79.0 KB Created: 2021-10-07 22:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 198a998d2ab3b861daed692fb1a8bed1 SHA-1: cac703a1b7c6d938463b5a226f95ecc49b89e9e8 SHA-256: a83af8b8463b4d4457ee6c2bc81cf5c8c8b591be3414f3b066fd842a25970f0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=recover+unsaved+changes+word+document', indicate a lure related to recovering unsaved documents, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=recover+unsaved+changes+word+document PDF link annotation
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/65708083354.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/98635896301.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156a5e285ead---96826173436.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/pipupazig.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20210922170003.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4d19ebf2eda719a2855730c9b39eda89/vavarebaduwijewumodoxal.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/1697147631.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6b46cf149---luguzisibugex.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/54645797246.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329d0337701---14487689298.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/pidirolega.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/xidusamunowunofesubiruda.pdfIn PDF document text
    • https://strechybenesov.cz/content/dawezimafujomogufenodisi.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/todudupasukoga.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/giromabapevaj.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/24223118120.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/75319814646.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210904_CDB90C63ABEA969C.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/16646809694.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109140452502970.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/voberepuvuseg.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/govozobeduvowojitadelute.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/32985032463.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/tibilajukidumivujilokan.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_off0000cf74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 10976 bytes
SHA-256: 9c69ec72ce1b588d72bb6327a0fbfc9933f22e9c771aa638b6fa40f1c055ed41
font_02_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 18012 bytes
SHA-256: 8f583e08af563b9591bef1fc6085c6cccd4a6e6292e8542db7895f8325ae9c25

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