Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c3cd20d67d324b…

MALICIOUS

PDF

88.1 KB Created: 2021-09-15 10:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7938085f6d36b375dae415a4f14aa4d3 SHA-1: 5f99582de183fbb409643b3c2198c45de111e073 SHA-256: e8c3cd20d67d324bd9df2c560041e26274a77882978f8db159b0deb57fad4608
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics points towards a tactic of overwhelming the user with links to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=pc+game+launcher+for+android PDF link annotation
    • http://denprokhorov.ru/images/file/vasep.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/kevamuruwolupokipogevo.pdfIn PDF document text
    • https://tipresentoio.it/images/file/49276535042.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/69896318063.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/fugigefurifepive.pdfIn PDF document text
    • http://fourfoods.com/images/files/jalagazesetumaxemolekar.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/51647669225.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/10352648970.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614142c86dede---33173524507.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/78ktsrmp6q2fl7f9r3a3vpm1n0/ziwuwasusosawadaza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc5d997c2---xotadolalibojonalaxulu.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/91865172369.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/dagudozu.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210911181229019551nk77ps7pzfg7.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1tjvup7ksf81avckbtvcvadjb1/femogavuwusasebolawawado.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613219d2e72fd---forutuj.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/19674643153.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/bikixojivevubokenagabetap.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/sonutuvujumiletuluzolipi.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/79884021171.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/ganoboxe.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/jeroluxoxe.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/rinabemixudijikanisorog.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_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 10756 bytes
SHA-256: d9b781c8e747578384294f06f90b68599e57c733d9e088ca54279c5548d574c1
font_01_sfnt_off00010bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BED 18132 bytes
SHA-256: 4ee923959ee5be13aa103bf63a60e516871a862696c0e88032db4d1351bb7b24
font_02_sfnt_off00013afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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