Malicious PDF — malware analysis report

Static analysis result for SHA-256 8552c6f2f8b7fee6…

MALICIOUS

PDF

97.6 KB Created: 2021-05-12 21:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2ea373b08b7cc96b873c7a4b50d1a954 SHA-1: 321627a4d5bb4c9879faf77d6bf7fb7e248782ac SHA-256: 8552c6f2f8b7fee6b394732d802ac2d5da65f58b30037dff56e188c60d1ade08
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings point towards an attempt to leverage these links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0daf814cd---25679894121.pdf In PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c127e5ba87---dibivoginiraxox.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/04f5fc056df044395e85aff9694654aa/rodemunezanuro.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ma0u0l197b3ekurgm3piqgmp6/lalofigipokilov.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e3081b0b---bejolirabujifovaginumenaw.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/fj8b5obhik6e76pauq3mr3n9v0/30285165663.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee0f482495---79782305461.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849debc029e---lerobofepetevajowijipevoj.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/8ab6927d4985cff07360f4b0b3ae01bd/68401298486.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/050f524cc494cd4c8d53995b2a34e6b1/lagetelivuwimixadidub.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/5jp3tt6sa45qumf3023knnommk/7000219914.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b613283110---66532695920.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/nibepewiduwabizeramatane.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/480f394fc2e98f1075fb2da9cf48b66b/paluwawow.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79b2b6006---40511930479.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dca76cabe---madeponuseburob.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/551ff2aa66a503e96b999b465f6bed9e/xazojaroposelo.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=laxmi+mata+ji+ki+aarti+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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014016.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14016 18384 bytes
SHA-256: 6b0fbca15bdf2c9a1d8a9d41661b8fdebd5eb45588da3c69cc71c827f9c8ac66
font_00_sfnt_off00010206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10206 5124 bytes
SHA-256: 8e88b938be7dce20ed97ed64819815c3488ab94d45eedb9a78b6c0f664c31d08
font_01_sfnt_off0001136b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136B 3772 bytes
SHA-256: e2c7bb3c6d2fbc6b9680c858ce58af9e5cd0e4fbc18f33bdd2ad1d5654d08a87
font_02_sfnt_off00011f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0E 9608 bytes
SHA-256: 65cdbde66a5afd0715f3a80d310e84d6d1db6d5e2f4cda4d96556c7526880def

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