Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8228b1fd5905e2…

MALICIOUS

PDF

88.3 KB Created: 2021-07-08 17:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c36f3f71ce72c9959de46535b28b0a2c SHA-1: 7e48f49b684a5fa76eeaf27cc5468c07a379d97c SHA-256: 4f8228b1fd5905e258139a001a4b7d428b41d7cafa9d6fb276a9edf897522bb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and links to compromised CMS upload storage, suggesting it is designed to redirect users to malicious websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the idea that this document is part of a link farm intended to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=bc548+transistor+replacement PDF link annotation
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/30651367028.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/59516265282.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/siliduzerat.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/teguzudabubeloz.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d00c4b8e73---mefifenivonerewiniwawi.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/tujisipewejepidifeletu.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/38433284856.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/3246510740.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa837e75433---24634016865.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/810cc5451badd7069501a0fdc9edbcf5/vekorusirefuzazalejirogan.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/bda8cf2f1f44d76ebebd60d831165330/potolenawizugitusoxebin.pdfIn PDF document text
    • http://yuha.be/_files/file/49206537586.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/d0b580967fbe2ccacdd6e723b814c4af/77576474811.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/sififadiwarezu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992ff23f1e6---13046253744.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/vimukefagadewopavuzod.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/nj7lqf922g8len7g803u8aeog8/99083389751.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/554r8eer3edcof1ijsc268pdut/zibenazitizetuke.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2vdu5fkjm8jetk9e7oejivf73i/kepabofabukuviniwovajad.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9472f79cea---94086080863.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/6a93ffaf88f176306faea0666a7bd115/98948187433.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/47d10b2df783fa0a0e874b7e0902959a/57646868241.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 18668 bytes
SHA-256: 8fae4482b3d3aa03bd525c35b446639477a3dfd11761ba914923c4375b783dad
font_01_sfnt_off00011785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11785 11008 bytes
SHA-256: eff8c2c853f27884f6d4384538d64b33477d397f00c4192131d02a06df56c284
font_02_sfnt_off0001312e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001493b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493B 2488 bytes
SHA-256: 29a2be99d375812b9e893903a27524f6242708a5da60ae3ff9fc1fb2aa9a0203

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