Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac75e166a1cafd5f…

MALICIOUS

PDF

86.8 KB Created: 2021-09-13 01:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 871f6e5f2ce737b4f8bb08fd94e5be40 SHA-1: 5431ffc3edf2e06027cfda6e248de0e3b77f2fb8 SHA-256: ac75e166a1cafd5f62e89820905b2b32e26a75938a58cd8d48536bde8eb4758e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many pointing to compromised WordPress upload storage or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=2021+mmorpg+android PDF link annotation
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/98691300016.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/45162636524.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/11874152705.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/15615912149.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/19353773774.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sujalojebevudojedubise.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/41297661976.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/tizobodetewowoxedu.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/majumamumunijijaromiwalo.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/lowuxofediguviku.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/sumupa.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/pojekepabugu.pdfIn PDF document text
    • http://idroter.org/userfiles/files/mabaw.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/92881474052.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/98256988579.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b16448934d---wazorosuwomilix.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133a8c60385a---39476166925.pdfIn PDF document text
    • http://change4best.ru/upload/file/latowesatabolasimeke.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/60518171217.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/06/bexit.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/873fd1ab9cbad8152f53fa2e5a8a27cf/51251350377.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/83153387631.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/mabuputavu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7df9e979---61275913391.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/sigiwe.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_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 10488 bytes
SHA-256: 4fd803eabe17201722d927606f3fccdacb3df70c4318e4de64b7d06be36e7fc8
font_01_sfnt_off0001085b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 17552 bytes
SHA-256: b3035bc4945c4ef544d8e70f60f348ee9ee0fe167bf6fdb555199fbc22d41424
font_02_sfnt_off000135da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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