Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4bbc3066b3fa04…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 13:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9ae021049347ad0cbc5b7dbf82928d9b SHA-1: 0565d7483ba12f5ea398ebd368b7e4f95dff9ee5 SHA-256: 5f4bbc3066b3fa04aa5180f60799be4be3778bcce55089e9e924bd3e344f7f55
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to PDFs hosted on compromised WordPress sites and disposable domains, suggesting a link farm used for SEO manipulation or to distribute further malicious content. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent related to link distribution and potential phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://rozgarnetwork.com/ckfinder/userfiles/files/23007391064.pdf In PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/rataridezafetejiguvig.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/ribasujapofazudinupotav.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/4a2s78oislg0raj9p9n835uq50/89389686755.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/tukokopatabewowagisijeduv.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/pefeteki.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/5q7ai12kmvtouajuorcoogmnf6/webavuzovizitenivugogesak.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/durigu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16075523bd0477---28401161546.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c116c848879---61284480592.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/38264698851.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/48210690614.pdfIn PDF document text
    • https://alternatifhosting.com/calisma2/files/uploads/36793054785.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c967dd78e9f60138cbb776cff1414689/robekivopataraxisipegami.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/duzekopo.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/16882847218.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/12590908733.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/fufaketos.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/9e77bd64cc0b081d614f430f623d3410/vibepafudugo.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/391bd5510cfb917940d99f6bf5d44356/walalawevopunedilana.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f02d192462e---70515606786.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a537db22596---lejiruledixu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160988e60576a4---12925412030.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/porexadilezovozopizoz.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/vinojorena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pioneer+car+audio+system+user+manualPDF 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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 10744 bytes
SHA-256: a5908f70618fcb1b3a401c144b38806b39320ec8b72105d028a52400906f047e
font_01_sfnt_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 18092 bytes
SHA-256: dd5bdbcc3421384732fa1addce18ec39b562510dd866531147610d8db06151ef
font_02_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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