Malicious PDF — malware analysis report

Static analysis result for SHA-256 298adb5a3a77770a…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 17:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 79713f8eb65a22297fb860f9bc1ca10f SHA-1: e48cec7127f87cdf5df0110a8db8c9f157e28cb7 SHA-256: 298adb5a3a77770a4266489f0afe6a93c3dbadebc51c8389d8a5cb074dbdd920
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rubyyadav.com/nbloom/fckuploads/file/47765240359.pdf In PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/58660682484.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/44748387512.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077130bad4c7---31541209140.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__610F978027D6B.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/rulidalu.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/pikasu.pdfIn PDF document text
    • https://starbox.fr/img/files/26341006118.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/17aie632hcuikg1ff0p8dcapti/80215820448.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kunaremeperepisubupu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6355d65aa---wigutumunajekojimu.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/sujateveribomoso.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/73968425962.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a94cd4bef2---35183274623.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b18bb9338---26724036096.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c84d8d7c---zovixukipovisarizidaga.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/92t5ccdu6cd51fr2t07pjudbdt/53510725019.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ecce8456ad481590011dcead3b4640dd/wolop.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/gijupinigivo.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/zawimelozelid.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/xujaxifilitijir.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/damoresesobamixebuxijis.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/47523236813.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ccf0d573d---72047206736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=metaphysical+idealism+definitionPDF 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_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 10892 bytes
SHA-256: f865ccf1a0eb79a518c400d3d626c7525267652660ff9471196e3b6a7d70f1ed
font_01_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 17000 bytes
SHA-256: 233b6b42ff67a9b4ab39e7d657904039abb2e668ca91ba5a398bdb1e60551ca9
font_02_sfnt_off00013461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1