Malicious PDF — malware analysis report

Static analysis result for SHA-256 976a6aa3a774949c…

MALICIOUS

PDF

65.4 KB Created: 2021-05-11 21:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79d870cc7199b185ad9531cd10b3d6ca SHA-1: 5064a2c0e49e439cd7f37d98908f94396aaefb30 SHA-256: 976a6aa3a774949c4030efcba911c1dd240216e9b67699529227e4c5bbe04a8d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting. The heuristic firings indicate this is a link farm designed for SEO manipulation or to host malicious content, and ClamAV detected it as a phishing trojan. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8630

Heuristics 5

  • 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
  • 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://crewmak.ru/uplcv?utm_term=formal+wear+online+australia
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/1048b0f86c02f604c57c43b0476a3938/fatimuzawaw.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/448036c482d954a445c17f697a7ffddd/2276031240.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b3b05054e04fcac53d29459ac1daf588/jufajasizumubibitunala.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160763fb1b3847---dabojaniradag.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32b1aa86d---ramidijiloxafedovedelures.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160987f505c741---laduferidivijusat.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d18be23365---63569425590.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/cae536c4e7e4bb2c18ba294caeac7211/wetitotefivumawebujek.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/mfmuc1mbajf9p5dbfmfqrh2uo0/10269830339.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2edcac3ffb8afdd8694c85c4ee36fe5e/76845452634.pdf
    • http://vmkmsz.hu/userfiles/file/widamonuviko.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0md2fvl6so7e8c5lhn1olqu7l2/zugetaxuvo.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/795f4f7bf1ae0c8f69c2ec789022cf1e/pabobemusuxadezuxozu.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092579b9da90---95571699680.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/8e2719db6b110943ec64bee346624ff8/vubutonokotavase.pdf
    • http://megat.pl/uploaded/fck_files/file/jupexiladaletow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/451463946fca2439203907f17ee003a5/kogulivoruge.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbe5.bin
496be4734a5179f0df8324f3c0f680a485de5421688568493609b6a6ae3f7605		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 4880 bytes

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