Malicious PDF — malware analysis report

Static analysis result for SHA-256 58956730d81c1e25…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 23:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 44dccaab59d8da5c3ad472e8096bc540 SHA-1: f6be1b93ce0e4c372251a08c5acea0ec71a8d8be SHA-256: 58956730d81c1e257fe6586c7b151bcd9c4e8388b726b1b60e6c600cb5c57af2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to other PDF documents hosted on various websites. Several of these URLs point to potentially compromised CMS upload directories, indicating a likely attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rajhansnursery.com/userfiles/file/91117514745.pdf In PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/dutesoxubana.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/98876370e782f9bbd012d155e50e359f/wuwesewumu.pdfIn PDF document text
    • https://tipresentoio.it/images/file/37505604943.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e3757cdd566e83271bc18c10feb7ad5c/sorunimebixusas.pdfIn PDF document text
    • http://bociany.sk/media/file/lasizorezodazexamogejot.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/94940980679.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/82670400439.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/narixujifijuxevalad.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13d3c20fa2---dusexasasis.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/38365851739.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/femumeladaxexojafon.pdfIn PDF document text
    • http://cga82.com/admin/File/71598443911.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/sasod.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/gudegavibin.pdfIn PDF document text
    • https://tuttoadomiciliocn.it/file/nofupojazizamemexenada.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5d441631e3f63e3bdff0aa4e5f68073a/vutubon.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/jeruvaruletutew.pdfIn PDF document text
    • http://nktrading.qa/file/files/gamowiwabepatinuxutapij.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/68688173656.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794c669a152---43176420684.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/760806f52426f37d27285b674593add4/dinijupamatoxalesidafez.pdfIn PDF document text
    • http://goref.ru/files/file/44584330572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=feminist+perspective+on+deviance+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_off0000e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 10776 bytes
SHA-256: 754c068edc26bb9df70aaf81ac5a3358f66bf6c2ef3fb2ef01a6158d47563286
font_02_sfnt_off00011141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11141 17568 bytes
SHA-256: 74b3708f4f4f2fbe522e5423c1aec2f6ddc19fbf6ab6fbaebba4412ec5ed6cbd

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