Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe77045510747719…

MALICIOUS

PDF

89.3 KB Created: 2021-07-18 05:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 550f5e860f9e4473340eed74f1e81471 SHA-1: 07e156523006921905a63d00ac9141e3d39b1189 SHA-256: fe77045510747719f7f050a8e29efb1b33ea412b57313dd592d5fc760eaf6a87
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The presence of multiple external URIs and link farm heuristics indicates a deliberate effort to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607828dc043a2---97021058976.pdf In PDF document text
    • http://beergolfers.com/blog/images/file/latuxizidujigusolepeguk.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/d5d75df1f245fedf7f3e05c352585d8c/daxodojunemuj.pdfIn PDF document text
    • https://hgb.se/filer/file/92800997463.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609341c9418c1---16897489439.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/wonimunupibev.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/33323363847.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160809eb419351---73065588457.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/18418343114.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4b1828c6a---viliz.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/dinusozitamudibino.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/pm0lct510tjtc32m6b5dkroru0/jopamidaba.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/dhc4q5jh1ffa6vkjj97idb7tkv/dijosifagajo.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a20b80598---lozubokorimikijogumasusot.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/1829978856.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c891f30bf3---82017824111.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/73370057591.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/f5dbe95d1861fa9093c6d2f9b8a90131/tawasaxedilonelo.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/87277534668.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/ganujegasujeronedevemaj.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/tevunejeruxenafepa.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/7834564226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ben+e+king+and+the+driftersPDF 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_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 17592 bytes
SHA-256: 1cf8e819e84f3dc5d1c6e1d2b08532cb90ce51904f43871917ca91333ca95689
font_01_sfnt_off000127c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDA 10612 bytes
SHA-256: f272aedf465ecc81150668a53f89102dd75b69469da5da04b284232e2479e939

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