Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b26acb005bf0c3c…

MALICIOUS

PDF

101.3 KB Created: 2021-08-04 08:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1a368cf8484a4b603cfc3885f82697d0 SHA-1: 574d0ad37aa3f4f9e22300e04d13414f6395ff3b SHA-256: 8b26acb005bf0c3cddae1c31a7af83e5d4794764ba66fd706eb19ec37807ce87
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bogd7agncdj9j36u03rtde5vmj/38977708918.pdf In PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///85621466749.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/xivuvumowopesebaf.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf8542a36---jafokasawib.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/455055856.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/fotixegigabutilipozo.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/56740345326.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0985bc3ff---bukerudokamoxopejojafegal.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd77b727970---fesuwikibatawunukigo.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c798826f330---taxumemuzir.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/u6d2153fr5dasu0490b6kgkm34/92673727200.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070141d47ca1---zerakewebew.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a4cf97a1f---65695069701.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/65601586820.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/98ed29047e1ff0c168c693dfa4203273/36556153658.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/17e1f926b854a3d46fea28bb7b9634df/74219253340.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2uda09o5i85vjeo39m6qddada1/4504613465.pdfIn PDF document text
    • http://gewald.ru/content/Files/fudovolisakagediwesun.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4f2159e62---xiganuzumoloveleroze.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dbbd4dc81---bivusesidexomu.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/midajutabe.pdfIn PDF document text
    • http://cke.hk/userfiles/87738799874.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b80c1bc684caadf46d6995c780e1b908/lugimipazezo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606cace71e35e---65338956005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hotstar+mod+apk+for+ipl+2020+freePDF 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_off000124da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DA 10880 bytes
SHA-256: 47b80bb1101a4215ca9f12fd2a08db92e07e5835f3d7302d055363d0a8d02413
font_01_sfnt_off00013e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E09 18488 bytes
SHA-256: 8f4aa6c43ce38ff135a4cf5f3dfcbe03c3fa3136c744c9d9c4eff503a1266ede
font_02_sfnt_off00016f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1