Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e8ca83f9f0e7ae…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 19:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65718892b2a82f70a86c2e4302aa8cbe SHA-1: d9354beb33a7c9c01e790ea88fad3b6cc0b943e0 SHA-256: 83e8ca83f9f0e7ae37acdf42a928950a78cc1af3e69a232f3e698b90c3d909f4
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. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=kemco+games+android PDF link annotation
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f158d1ab7---besal.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16132103ebf4f2---27064282468.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/nuxafigozurupowegesitu.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/63323757419.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/ziwozunugi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfef776066---gobugofegujog.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/75327947490.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/tujeputudixanejorut.pdfIn PDF document text
    • https://laser123.com/geektic/files/14727421676.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a49debb32---xejivozideratuza.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/pupedo.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/faxisoravejitisum.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/jobajezexijebiwonup.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/6606066538.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/15084578965.pdfIn PDF document text
    • http://dytac.hk/userfiles/vosoxixa.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/fexerulaxabigakemisow.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/2446368200.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e0c94f532f10dfc989819af96ecd799e/63972968767.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/tizikatodonix.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/54837663775.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/17113234116.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-14/20210914120408197508.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/45435682624.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/laxakopoziverubatujax.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_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 18096 bytes
SHA-256: 4330d3ddfd4952043b7c644db2db6ac7054febfbc6028f4af3b0443c94ad275c
font_02_sfnt_off00012cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF2 10560 bytes
SHA-256: 06fb04e25e0ad7bd1f9fd1dba2beb273a4b06a0b9f1c6921a46ecc0d2f49e71e

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