Malicious PDF — malware analysis report

Static analysis result for SHA-256 d210b6d72cb2bdf7…

MALICIOUS

PDF

116.7 KB Created: 2021-08-13 19:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8793be01b693b807b6be6abb194c6678 SHA-1: 9c51f6da376c211cf3fd5193536735c771d96dae SHA-256: d210b6d72cb2bdf746a580017558874e3ca0f17b54938acdd365f8367b2e53bf
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, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, designed to redirect users to potentially malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pincailight.com/zk/UploadFile/file/2021070700132273499.pdf In PDF document text
    • http://auxerretv.com/content/public/file/nadagijufesixova.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a081323070---86626335139.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076e3c1926d2---joviwaxoworojevavojigafax.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/gonoxofibimute.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/sofefenutubaxixemip.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62355191885.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/geq9hgqethf444tnpbv8tem5v6/75784109420.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/soveniteselas.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/pagefepemajukuteduxabera.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa33f0a402---rulukodivukuderiwovirefex.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/9ccef2586a61cb69a5434c869bac4d3b/vavusolukumipoxuxipexud.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/51b31869cafeb6b9be6a3e0c28a48ee1/buvegajawoseziw.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/72767209412.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f999bd3e4---25738692778.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfb6ae3250---47025123655.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/pukofeviwimizolurumisi.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/bogobojemukavewugegigir.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/584525409aa0da5142456e39396dab4b/zozufizekosavofefafulelu.pdfIn PDF document text
    • https://tadimtursu.com/image/files/revitib.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/am8jn2l8e9fkohm6thb9cr0op6/83108575978.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/12722153024.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161064e5d39994---pemepidoxew.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/forogefatiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hunger+games+catching+fire+chapter+11+summaryPDF 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_off00015dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000175fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175FC 20716 bytes
SHA-256: c2c8f471eeec631791365ce5bb967b6cdb598fdc2f41e9c707f661124a061b46
font_02_sfnt_off0001aa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA7F 11016 bytes
SHA-256: 436713dc62062f6daae490a6cd3fcc6688ac781e02e14ac846881c9c1ce35c92