Malicious PDF — malware analysis report

Static analysis result for SHA-256 df35ad29be639e6f…

MALICIOUS

PDF

105.1 KB Created: 2021-07-26 20:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 9a813577603de3c8d9059a758ea21b87 SHA-1: 8098e5e39bf5c4b7461d7f7c390a280abe0c68e8 SHA-256: df35ad29be639e6f15aadde6a098125095da8a22b73068d0a05e815d5b2d8bcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://bezpiecznamlodosc.org/files/file/darogujosalozisaputovexiv.pdf In PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/nomawujapevedekitiribexaj.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/38027819209.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771f2ccdc76---jabasutesitet.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/rasuxajizuwavototowev.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/fifedidajibuga.pdfIn PDF document text
    • http://humanlitech.com/files/files/57499135207.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/xodowudiwogid.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/53910049567.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/90515208493.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/edc587486ffddda8e5e44a9272b45fc4/gujexofipuze.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/kosolabokivokebon.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/62985433985.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f8f1da7c6120b031b77f360be7b4c4e8/89261693584.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/6803161728.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ql19903v5ir83av4v81if3sdg6/weferejumatu.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/20244172926.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffa80254d8---25146109983.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a3a3763c5190e2d7baf236ef1c888f53/lafugasidavaneridakiriso.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e46c0ac145bd944c6df0e2a0e7c48259/91157825258.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acb8a7376e---11989495646.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/39527328153.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/wukotabojiviwatuna.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/62878864564.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/83004350056.pdfIn PDF document text
    • https://clinicaveterinariacabianca.it/file/jozopukas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sedative+hypnotics+powerpoint+presentationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 18288 bytes
SHA-256: 4cb45d74e707f80425d8d95d31e3a88a5bcbfaabc85b72e10d9ba8380708ce21
font_01_sfnt_off00014eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAA 10908 bytes
SHA-256: 7272a201778703b39d2740cbd40eda67b2804f993f3bb1f8843fe5f6f900313d
font_02_sfnt_off000167ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18000 16084 bytes
SHA-256: c27fafdda185be2695e99106f22849c7304d1d4eff2202c3575f3979fbde09eb

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