Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f411e29ec54acd…

MALICIOUS

PDF

80.8 KB Created: 2021-10-09 05:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d9cdd0de0f86ad6c0e98b98e7dfb050e SHA-1: b628f9dcec60a9d2136455d50537e5290b744b95 SHA-256: 66f411e29ec54acd65612ee294750f1ec01bb6e2b83a51d11ed7d1ef2f12c180
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the nature of the URLs and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=expected+in+tagalog PDF link annotation
    • http://kssi.ir/public/userfiles/file/96510636728.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b785bcb2cb---rixekupapojumuko.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/limekorabedegup.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/79813915820.pdfIn PDF document text
    • https://rotitelor.com/contents/files/batakoxobowiwilegeminoj.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109161737329141.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/62d41e0178d0ad7c572ffb90eb89ae33/wefijilopadoledevudetika.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c7e4229a1---jawozave.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/49536718863.pdfIn PDF document text
    • http://marine-inox.com/i/File/poxozev.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pahska60vqgb0mndudomnrr9hq/75754656167.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/22368840377.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/48155468513.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/bupatoxizazotaluzujununi.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/rss6gt18c8b0nruoht41pcg44g/15984726667.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/zewurokovadorexelafadarav.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/wowasusipezuloxisererusev.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/jewesunelutaremepimeno.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090407494374.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161595fedaae79---3666381017.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/72321616129.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109071749201284.pdfIn PDF document text
    • http://domplus.su/userfiles/files/36370926502.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///perifekepam.pdfIn PDF document text
    • 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_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 10504 bytes
SHA-256: d3f8cf8e0e8d813513dbbeba58ccddce09142189f23f3fab7fb772aee93aef88
font_01_sfnt_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 18728 bytes
SHA-256: 303e3894aff9df219f83da0ee0d7faf615541a2c4dd5405325d152e7bef9cb66

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