Malicious PDF — malware analysis report

Static analysis result for SHA-256 3baa7ad450c32276…

MALICIOUS

PDF

99.4 KB Created: 2021-09-08 01:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b10af4098640050c47f5cd33581d5697 SHA-1: ab0ff2a1207c58c86f757d21af42db55ea332ace SHA-256: 3baa7ad450c32276034e5d856531cfea164536fce79b124bd800b9aa4382be31
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. This structure is indicative of a link farm, likely used to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://alphasigmaoverseas.com/userfiles/file/dixifefav.pdf In PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/db518b01928e8baac20579c4a726401f/rilobowetubifumedopo.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801a934f455---sapipafebumezone.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/bd8c7af52ff52b12003c2a375b6c4ae0/dorobotisarel.pdfIn PDF document text
    • http://cycling-software.com/files/file/xowomoxalegidogosopizekav.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/nurowujatonenikipusuzak.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aceaef2cc84---62827256236.pdfIn PDF document text
    • https://fond.ru/userfiles/file/24670129755.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/79177523240.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/41020962147.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dogenezuzilolasagikebu.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021080201333_1025688395.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/gijevalulufebeja.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16080649ce97f1---varabugapofakexoduxot.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/87048260762.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb79e928fbf---16915542494.pdfIn PDF document text
    • http://polkovnik.su/upload/file/15403876501.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d40b5d24f0---kisasalejerixol.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c1308b743---25377338335.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3gsh24ab5p8bmb3fqvjgl2vn3i/balif.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/1289886244184340696b1ed3231187f1/texenenenujopefozabobo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8ad6918a314a51e313c0f78a9ab7ee2e/rinel.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/18040429288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=searching+techniques+in+data+structure+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_off00011da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA3 11056 bytes
SHA-256: 22dace9d31b4d173989c705a5b9e1311c352ed85f499d2026de2564c5c5dbb00
font_01_sfnt_off000136c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C7 18800 bytes
SHA-256: fa7f11647d257d245038a063e2aba76239e97932fa047114154d6a876e5faf9b
font_02_sfnt_off00016795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1