Malicious PDF — malware analysis report

Static analysis result for SHA-256 83923b7e3850aee6…

MALICIOUS

PDF

90.7 KB Created: 2021-09-03 18:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cee615f2ed91eaf69b4ea2bc66849dbb SHA-1: a090ee60b2e3ca70fb43f3aaa19d46f3022e02db SHA-256: 83923b7e3850aee6801c2c2714a07a842dbce17cb0deafc3e18b1fbc96bfc2e6
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The document body is unreadable binary data, but the heuristics and URLs strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0b99fc8f132e85be3c90c103f7959b42/zejakoxoxuboxuxepo.pdf In PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/30293083280.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210813203816.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/69782782679.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/45123899390.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/rurumol.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///7751869541.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160f6efb938b04---nodej.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/babaf.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/pisebesusegatejojabel.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/tajokexup.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/tinumaranewabifere.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/im4sqj9targu4o4rb4drr5o9g3/guzad.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac07065234---61366218640.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/q48ek7v96ofpg3hts3t4a9ppib/sijovina.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/du6el84q9rtlca1rn8mp7957b3/43260503868.pdfIn PDF document text
    • http://regmac.net/userfiles/files/75862504078.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/8dd08712c66d47dcc80fc0671c2a9d16/94604926683.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4656c1f688---ralejekara.pdfIn PDF document text
    • http://goref.ru/files/file/pibezen.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/io5kbbj62a6remu7c3uuja1j07/wodivatigepi.pdfIn PDF document text
    • https://webmenuplus.com/images/file/44222796052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=academic+ielts+writing+task+1+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 11056 bytes
SHA-256: fb990f03d046ea6a32fe49283e07c6332f2a2ae2b603fda14d600ae0a625d264
font_01_sfnt_off00011223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A35 19264 bytes
SHA-256: 2e9f8f4f10a97fdc268d2478db7f7c5359bcec5939b12ab6b4d8a85d53eacbd0

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