Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b800e64e803bbf…

MALICIOUS

PDF

85.0 KB Created: 2021-08-17 03:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c51c3c670ec0f732614cf4d0cb02bac4 SHA-1: 1d99cdbaac2deaa8393546aec31b9b995a30beba SHA-256: d1b800e64e803bbf515738747ec6b86756c198cdd6d8a68e1e626c7e18602d35
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs, many pointing to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of a URL with a 'utm_term' parameter further supports a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://garglob.ru/uplcv?utm_term=data+structures+and+algorithms+made+easy+in+java+data+structure+and+algorithmic+puzzles+pdf PDF link annotation
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/jimubadinulujilusavagujup.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/lijumifo.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/08/15/10238363993.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/buwonixibupixofom.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/fisasew.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45cd5d8eec---nivolid.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/likewib.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/82616692873.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/90577384544.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/118299e74a8cdfd615f4c1fd6787314d/mojapoweripabutogamil.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9c6dd277b45cdfbd52e08b1f2063fe69/pajinabin.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/dowovejadasakuze.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ab896e74---81784441877.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/11517699120.pdfIn PDF document text
    • http://midlandhigh79.com/clients/866549/File/78036438885.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6e2d944a9---kafipizevela.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/zafidoxarikadol.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608517705ee92---31007337155.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/44389598767.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc02669cae1---23001565432.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/b307581756beaa1ec835bfaed5aad017/dugabegoziwe.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/donejofigupejagasigovifat.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6afa5a1b7---30638709312.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/rofudesonefimetesozi.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160764336a4e2c---zevasogugatupe.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/kovitom.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_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 11540 bytes
SHA-256: 36f5030a0f8e0af65e80f1e5ac43fd98854d6bcfb0247941feabec4677650637
font_01_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11822 16916 bytes
SHA-256: e6fb96d707b94e268e1738eab37ed04aaa257d515d5bf05e0042742af2c37d69

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