Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b22105a19913df…

MALICIOUS

PDF

122.3 KB Created: 2021-06-23 04:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 044f833f48391c5e214b63eb1c7f12fd SHA-1: 84e5c742237f50a43fc3d4a6dabc6ec875653282 SHA-256: 29b22105a19913df7dee73ccaf4a18c1ede61e4b7787590f17ccb2226ea2be31
156 Risk Score

Malware Insights

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

The file is a PDF containing a link farm, with multiple URLs pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd235f6c737---2694075927.pdf In PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/13915889232.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/kn3j19mfb0i4f52ugil2q1rq3e/rabepelebolosidowakopo.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a89dec62d449df5aa48147339960b5c3/dubisezowujupixewe.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/64419982311.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/23d1b3bbbc3b30e13376204f1d69cd6e/makonazemutizurupomepor.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/3297e6261015c7c090fda7e9ed736c15/23893902708.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/sdiu7bhg3el6eh1t1vmnf6k0mc/60771100022.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bacf84152e88551a69dfa8340038e210/67788665914.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/1477bf342c8acc299c6c607896fe53f4/sifowogetopinotebirajani.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a7af31edb---tisukesowokukopudorabar.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/34662693221.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ea42b70449d0bb30c333471d6ae29f41/68211928166.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/kulararazi.pdfIn 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/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=jojo+vento+aureo+ps2PDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12934 32224 bytes
SHA-256: 27afb5aaa1dfc8dcae66d278eacea4fd8e1e5e5b99fb8b218a41f61eec865f8c
font_01_sfnt_off00018d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D68 5036 bytes
SHA-256: 656988f756de96d747e9b88fc8361502e96db38724ee9bfad7d78b40afd40336
font_02_sfnt_off00019ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EA8 10900 bytes
SHA-256: ceff9b904a8859e02e94dc14dcbec079f23117d46851c11fe3e605af233b233a
font_03_sfnt_off0001c37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C37A 16748 bytes
SHA-256: 5d53e9c5a7b5f5b1928c5575eefecf861a3e3d8168c83a206e890d83c2d087a1

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