Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2d05f17d5fb4c3…

MALICIOUS

PDF

100.0 KB Created: 2021-07-23 10:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3258815f72c9a62d58ea352e532a6310 SHA-1: 4abf266689d1e11dde2b179d6612f50dfc54a995 SHA-256: 2a2d05f17d5fb4c3bed258de98c8e150225724c28965004dbd1c31280d1238c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content. The PDF structure and link farm characteristics are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b73814588c2---dexufofumakog.pdf In PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8302b29da---fujapedukigig.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a56f9ccf95f---golodagoba.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847f1ace767---fuvujoniruxivegopux.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c0766dd2ced---gowurevizowalox.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/juluwipuzutos.pdfIn PDF document text
    • https://masihpt1.com/contents//files/luxupenofe.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/26pfdr9e0hnfa7lknl4c8cl9m3/pivugafinodax.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/rutonuwenireloxekevad.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3681be652---99903607524.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/57907031039.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/82867335951.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfaed74f3d---vazabevekoto.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/49626033856.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16078615c9b2f2---gigodasefejawiloj.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/jinabekimabew.pdfIn PDF document text
    • http://fittbikese.hu/files/file/37989895210.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084b09075ab3---gekepanawusofamigolarem.pdfIn PDF document text
    • https://go2germany.ru/files/file/75872214709.pdfIn PDF document text
    • https://mollis.rs//files/96989043335.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608acae2cd817---85351909314.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/d58v2t53ar7si1ov1dl5e04l49/jutosijur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=iphone+xs+astrophotographyPDF 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_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 10560 bytes
SHA-256: d21c345657e8dc4137f45166e901d8843e3cc54b92598e1e16b4569a90d0ec9c
font_01_sfnt_off00013973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13973 17808 bytes
SHA-256: 79ff37858b4af4be05d3e5eea0f57cc8859edb6fdac899d361102227ea4f29ec
font_02_sfnt_off00016835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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