Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7873e3b7fd6abc…

MALICIOUS

PDF

179.6 KB Created: 2021-07-05 01:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a4ff627516771a432f6c8df19fa7329c SHA-1: a2a0a349539c09bb070acfef4fc55f904532b56d SHA-256: 7a7873e3b7fd6abc9910ee9a94d6dcb2cc32d9ade96eb94378900a731f91f7cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of link farming. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to lure users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8527

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 http://nfc.soo.jp/file/88664765398.pdf In PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/873607471.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dbec9b06b---30370951736.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5453cef29---xajalopawifurasakapi.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/sovedotarifonatuk.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc698bedb8---32418547072.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/g5tk7ej8amudhuk1gi5qhur23u/senarokokibaweduvi.pdfIn PDF document text
    • http://charivne.info/images/file/rofuzulobi.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/7e1986c56ba030432da281c211a6f816/76495865873.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702fe6c28a3---22801238399.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a07ee7fd---38397439280.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e1c9dfc762288ca7749acb558717d2a0/tomizager.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/66306476306.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/54762022254.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/36398008509.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af7ffb3c34---mobogiwavoxazotolelulen.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/37121175804.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/muxusubok.pdfIn PDF document text
    • http://aps-mes.com/files/file/2703561685.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/eac1ea6abdbc2bb36eb139fe2ffc28db/69868622350.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9794d63d57eea631f94cf661fbce583f/7435991121.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3277f27813---46274123798.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/59344581073.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/6706750871.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/t1936q6abovllqqf7k9p1crud9/rowesuluvezonokoju.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/rabamuzikiwib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=interesting+facts+about+uranus+planetPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23230 16424 bytes
SHA-256: f548312afcab3eb21e2bd0409b15617ecc4b39c87007fbc415533a34227fd61f
font_01_sfnt_off000248df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x248DF 10848 bytes
SHA-256: 17369bd597437de13272787fcb233bbc7bed8bfc11ed6e9bb441d3c91d764118
font_02_sfnt_off000261db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x261DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000279e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x279E8 1948 bytes
SHA-256: 600f1b1d46f13496f8dd08592da2d1722b3770d9e4abe7efa662907db0cff4b0
font_04_sfnt_off000282c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x282C9 23804 bytes
SHA-256: b15f06d67e95bf558ff685a701da7607400584cde38c4f9ada282c68c79596ae

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