Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b2a4fd7458cb49…

MALICIOUS

PDF

88.0 KB Created: 2021-08-10 23:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 636a20b1f2e104d27c52aa3fc873ae35 SHA-1: adf608e052d3782d62527b5b43f02a82a6eca836 SHA-256: 00b2a4fd7458cb490217bbedb9ccdc367b32dc4e5bfdb481a1cae98477db74a2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV heuristic strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a link farm strategy to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://chcial.ru/uplcv?utm_term=ejercicios+de+lectura+y+escritura+para+segundo+grado PDF link annotation
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c84300c9fe5592a6dbb748b2c91d85e3/38350316267.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/7edlh5j21eflo4l1ofhbqvtmgb/93981367717.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/8rboj02tojfih5lhmk5svrt145/nabebadazuwaluku.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608828de8c488---xexebutope.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210716_003537.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/sutavelewenapiwupibad.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/4729790874.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/tobepuvirotepufuda.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1984cda6d---37405401744.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97ed6ea0f9---40295146322.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/29d702476222fc7667027d6a8f4404b8/xupibovuzepop.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/3797177485.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/55872005344.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/93200526328.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607699329907a---gopivetumewedajenew.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/rufilorudifavodazina.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2c5dcf9215b602c5447d9c58df18119d/32741372013.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727aee82506---83728209399.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/77941546897.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/46758208832.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/fomanuxub.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/zedavufelatasav.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_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10953 11016 bytes
SHA-256: 100267dc6c56f596b60c6224001bae537c8ce01fecf2563148f49aa4f44282a0
font_02_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 18192 bytes
SHA-256: 4c620aa1450c4a0cb80ba738a6b500cb81c3a44b01d761198bd2e1dcbcb8b0ba

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