Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75ce19bdbbb310c…

MALICIOUS

PDF

73.9 KB Created: 2021-09-19 19:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a9a8342ba17f610fde9a54904a3ebde5 SHA-1: 634fc5e0353d60c4a2c96571a11360c029dad720 SHA-256: b75ce19bdbbb310c1298c88058b47de64ee266b2ae519de1baf65d054a589e2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest the PDF is designed to lure users to external malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 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://chcial.ru/uplcv?utm_term=ld+player+for+windows+10+64+bit PDF link annotation
    • http://wronba.com/uploads/wysiwyg/file/bugudalabuwibulo.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/vs2t5ariepo0iefvan43vs7l5p/73002073481.pdfIn PDF document text
    • https://yasacompany.com/upload/files/28190131583.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/27002843247.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/79654828622.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/22338996552.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/litobol.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/vekupugunovogujoje.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/cjt0suh30ip5m268ui7jo9bki8/73374273265.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/kelesogugukiw.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324318b8e8b---xewulumefujemefamup.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/jidewizivurabogeruruwa.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/piwenonuboxabapidu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/wilewujovafu.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/32761953138.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/rojutesizijowewor.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/mifuwapi.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/82555782864.pdfIn PDF document text
    • http://idroter.org/userfiles/files/51965081243.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210911213632_1788033621.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/tinufaduvefuji.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/52871025883.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/42030188471.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/98744208764.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/gadawiwowe.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_off0000b9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD210 17780 bytes
SHA-256: bb0fa6c780259d3ee44e580f34b707caa0e48dc9d7a86ddaf597766ad5daa07d
font_02_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 11208 bytes
SHA-256: bc915baa636721ee343a89307296792b3638206eb76144656aeef2451743f203

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