Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42c60e467480a6e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 05:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3647c79dfbdae6ea5bbdc270699aaf1c SHA-1: 73839a020d8fdbc7e9ebedd7de26e04726558042 SHA-256: d42c60e467480a6e7fd0cc167f5af81c40a181f6fbb0bbf8531451a1d19d11af
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The primary goal appears to be to lure victims to these sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.tristar-technology.com/ckfinder/userfiles/files/kegijutonobizul.pdf In PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a150e715e8---jadoxunopow.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/vetowefonusiwixob.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/46870902461.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109030202238221.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320d4b365a6---zufabavez.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/melevo.pdfIn PDF document text
    • http://uchid.com/uploads/file/kabijewivenul.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ce45jv6eded5s18mkhd35h5it4/xezerepimefudu.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/k1p6n0bs7cj219ahmqv84msr6e/saxijilepavimo.pdfIn PDF document text
    • https://12shio1.com/contents/files/43116908864.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/85170926761.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/hf7ege53rcgdc2pc76dg8t3t6n/5574198460.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f0df0e8671afe96988f5f51c5c1c4065/80071679296.pdfIn PDF document text
    • http://budropol.de/Upload/file/mupadijutuxanoziwobi.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/17759236647.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1337f0e99427d6470becda172329c1f7/siniginenewapik.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/90836012418.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/43027219070.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/c7iuhe8nnnqieee02ur9q4kg82/1106610088.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/lanaruridujererefunem.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/19506419414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=redmi+6a+software+downloadPDF 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_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 10812 bytes
SHA-256: 2cbb214b4f2b82a15f51da98c3178297bc4ab3f1e1614ef687b5e4c3de701955
font_01_sfnt_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 17772 bytes
SHA-256: b4ec611027683ef4128849b30f7995fdf6ba7bf0daad372f5513b06369fe9758
font_02_sfnt_off000121d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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