Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ee789e0f645aee…

MALICIOUS

PDF

87.2 KB Created: 2021-07-31 14:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e5bf981e25902a3c3f6c069d1e8fb85c SHA-1: 3b666e87a31192b5684e0ac82e422876dac177e9 SHA-256: f5ee789e0f645aee1c213dcc1557fb206ce559d99a4ae6554bed2310e2e2e31b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or scam operation. The presence of embedded URLs and the nature of the heuristics point towards the file's primary function being to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://krisoc.ru/uplcv?utm_term=pri%C3%A8re+universelle+pour+l%27epiphanie PDF link annotation
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/livibewafusamotiwamos.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608857b63483a---43423128592.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/78268458295.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/488f28425df8a9f5ae950c0afa53d23a/6264895458.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/latewedowixidobeg.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/mebitoniguwifomomobofu.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/guxuf.pdfIn PDF document text
    • https://digbijoynath.in/iisc/ckfinder/uploads/userfiles/files/babukevulibuwo.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/82140263f2ae8b5a9efac425fb10ff60/bepanebobak.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d75c8f98f10b9d9cf3d2c21aa27e6527/tuvekebimozunudun.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5d71d52281a1ccbb2e3370d48e9a6cf8/bonipabazoli.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/satufezawa.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/refomata.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9c0d8c1ca1afdfc55e8502510e28a4e1/vesipekebibakupetulu.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/jejotojitozomugijali.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/79544438755.pdfIn PDF document text
    • https://loctra.net/userfiles/file/27433707349.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/p3odi5van7kat0jlojevme8v0t/24456404501.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160807112366ff---filemaginorajufefizo.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/pematumapijutapi.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/016d0f7ce8e2807e3516496016532258/gilonenusabamibibumebas.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e51725d36---funikumezag.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210608024510.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/de1c24a800b7db3006843319aec17b27/11938133550.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/38911653895.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bca70ec5566---96077403724.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_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 10608 bytes
SHA-256: f13f56a49753b28c21a0916d0d4371958c52433520110b6adc67d467a1f9cebe
font_01_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD1 18824 bytes
SHA-256: 33b52c12d1973fd1b1ee4e8c7df41c6bb2107f4da752b2711a4ae63405d46ec8

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