Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b9594569ed4a7c…

MALICIOUS

PDF

102.7 KB Created: 2021-09-07 20:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4cb6dc82ea7c984b240c29d7fd796d66 SHA-1: af70577217e292e264b90ef633fcafa689934837 SHA-256: 90b9594569ed4a7cc7f998f02da69595e29cde8deed58d1f4fb5a73b0bb64cdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the link farm and potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609676d911e8e---20781603932.pdf In PDF document text
    • http://galluccifaibano.com/userfiles/file/mikusanogavemukenujar.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/85095283228.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/1542652625632d9b147c6376a2079037/65513410273.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/79623781034.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2cecdab266a902a421a92906241734af/61478972929.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/92f03e60f5b6ada5334e35e860bba32b/ladevebeputigivosez.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/36348118930.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/ginisojolesizugado.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/83138225314.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/34452202942.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/patewodomuweluvemib.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609602b5f31b4---fejotowalarasixudojuxijid.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee138ddd32b---rudidofixerulerux.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/nebeva.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/luwajiviluka.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/937e8416d8f63b6a3479dc81487ab6d9/36190968120.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17ae890a64---nifogiwisutumolez.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/wosabibazewevi.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/36713649231.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3rn3ev5sjcruoou782jkkftsh4/gubodi.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/d85008ee725e1717c8cc8a099d50719e/81246032831.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/gebuxisi.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/2404557805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=kitab+fiqih+ibadah+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_off000122d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D0 10204 bytes
SHA-256: 4f75f9e3bc8f7c00fee6cc629e28b9e69ad755de392ea59964d2b56f060c835a
font_01_sfnt_off00013946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13946 23648 bytes
SHA-256: b1812f7023bd2deff8645b35b0e2d8de62d9a42327f4bd926a15cb362cca2f3e
font_02_sfnt_off000174c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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