Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ca3a8bcad05109…

MALICIOUS

PDF

74.5 KB Created: 2021-09-03 04:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5bd9f2f9cff94b9f987025d1a244c336 SHA-1: 4aacfe40af3be3a87afdbfab49c700fc3cc06ad7 SHA-256: 68ca3a8bcad0510936d0f337beefe1887343e20a446f84f9bc6f36d3b70494cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=definicion+de+aprendizaje+cooperativo+pdf PDF link annotation
    • http://sanmorales.es/userfiles/files/21120435002.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/37486715662.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16119a8c26a45d---17441152826.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608500316bf7a---jogekojiwisinud.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160767f9c3acb5---38543877514.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607929811e918---90386578914.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/nijivalagusezefibiw.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9df0ffd26f6572ba8c231d8b2b990837/50156794337.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7051fe956bf7e3dbed19469f9fe934d0/45125070931.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0c26c9601---vusiwawavarofevefukiva.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9bac68e93---23494363470.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/76529324794.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/fipokulezuvesusage.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/ddd8d736fe9f7582c3a84e44f445356c/kizapufezabejemanubewonav.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/15618534876.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/j0bs82aeeu5mu18pa8d6kdnpp2/fojivozobosolojikojatino.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/67598932540.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/wedasalubosovorixuzalekug.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/motaxivujosos.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e7ee16ad90c0ed5b7bbcf8378fd1aa04/4223050293.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0glgukegidr0ddlvfsnq673ffo/3599961831.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/36861167430.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/de97374b399e8c3109502d7fdcb41304/wilusara.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_off0000c11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11C 10656 bytes
SHA-256: 094a37c759f64ae87a424f171d180a8dcfa17a23e2abd3132e2864fc9211201b
font_01_sfnt_off0000d9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A7 17064 bytes
SHA-256: 4228b0547bccc8cc6f66708141bec12c1a417175ad214fc8d331547cab444ecd
font_02_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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