Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cbe23544d8d2eb…

MALICIOUS

PDF

119.5 KB Created: 2021-07-29 22:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: a2bc07fb25708bcec7b48cb04cdaedc0 SHA-1: 34d3dce7e1aa3629de69ee95c700a56a070a5208 SHA-256: a4cbe23544d8d2eb7339977e88ba0cbdeae6157c6d4bf48e41519f2a984d8f09
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the nature of the detected heuristics strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9808

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 http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4b8pj37o23r6vuogfm64ma3n20/bujemuruxet.pdf In PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/60947b33cb9aaa867c78077f21e05ce1/66979024372.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/707cb2411de4b3d19d06defef2d30531/64522201670.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/wipukebegim.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/tetomoke.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/36043096274.pdfIn PDF document text
    • https://suksesunited.com/contents//files/77435913526.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607547559923a---ritexavero.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3f259b1d4---wenazegita.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a7a873a92---balajabudafebigowa.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d06d54e94---95302856596.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16218902561792843418.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a555224ee2---rilapojaxabib.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/tuzexazowenevab.pdfIn PDF document text
    • http://3lbordercollies.com/clients/a/a5/a537dd6ebb785c9f51a9b4acbfea693c/File/leladezidibu.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b29bff3e39---xagemufij.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/a272fe7882797da45ab6ef9e7513ac43/fukodex.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ml8bht32b9508a3gsrv8r615i6/99869232320.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/vevulobazunuwujusanateke.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/84242813545.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/87516219041.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/4266140701.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/pobidifenofi.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0130ef697c366d389eee024cbea9c35b/sifanot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=xln+audio+addictive+drums+2+complete+v2.1.7+r2rPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 11136 bytes
SHA-256: b46fa14558551100ca237fae59c275fb42a29c394b504edd1d629c3adc1c2ce7
font_01_sfnt_off000116f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 20360 bytes
SHA-256: 7009807e563fa47525d9eb8baf5aa4f0581ec2538b2355f39059720d11cc3d5f
font_02_sfnt_off00014aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFF 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00016073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16073 31588 bytes
SHA-256: d9e032b21c723967a0ce0cc73f707110401a43ff7cfe1af05c18f37b8e2ad77c
font_04_sfnt_off0001b6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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