Malicious PDF — malware analysis report

Static analysis result for SHA-256 a002e7c108944eec…

MALICIOUS

PDF

76.1 KB Created: 2021-09-06 18:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fb352d3bed4a1703acea22df8980b331 SHA-1: ad1f14c8db1641693759df151b4b1b920746f5b7 SHA-256: a002e7c108944eec5e8b47af4e23aef28b03d7c6ba4656a663c4cbc4a24c941d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is designed to lure users to malicious content. No scripts were extracted, but the structure strongly suggests a phishing or malware distribution attempt.

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 http://technoculture.cz/admin/upload/file/wakuvopabe.pdf In PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c12e2c8bcad---kovepikik.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/vugezi.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/75291307972.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/bde0b875f55b04e117b7cf34ac11c74b/44414307794.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086c605d2a97---45181410901.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/zasonebomibemi.pdfIn PDF document text
    • https://hoalavender.net/upload/files/67806831396.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/76884477216.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/jidisabin.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cdf742e14e---rogaroropaxutupoku.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f9919265cd---64766437552.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/xuruzemazotis.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/zorisiluvanodisipibivimi.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccae3b8fb8---21900903001.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/pofalefimoxowarutaze.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/27069632976.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/rufuzalonagogijiset.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/eec764534c8dc3c11d53847953bae2a8/dafururijexaxiwomaj.pdfIn PDF document text
    • https://ivaco.it/file/1364075173.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8f65e7169779dec9b3ee1e618b280192/neduj.pdfIn PDF document text
    • http://bjjiffy.com/upload/91302759735.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/emgebdivnd3qo02o8gp39cm4f1/vagekakojaxev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=iec+61850+pdf+free+downloadPDF 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_off0000c30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30D 17580 bytes
SHA-256: 0c2442fdc7eba5f94dbb1ec5f783e64eac8b208f9eb9f84c8cb576d3b52f52cf
font_01_sfnt_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 10976 bytes
SHA-256: 404f32a0c7c6646b3b4125985db8260c478dd7afcaf069f7a163f5f7e3859aa1
font_02_sfnt_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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