Malicious PDF — malware analysis report

Static analysis result for SHA-256 abdf22d536c19880…

MALICIOUS

PDF

84.8 KB Created: 2021-08-25 11:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d278c02baca3fe6f4e499871fa7ccb11 SHA-1: 38eef8b93873e81ff46b678be5a1863dfb56d530 SHA-256: abdf22d536c19880d322dafec45dca6897cd0de67c646fc4ce4d613e192f26ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm or redirector to phishing or malware distribution sites. The PDF structure and embedded URLs are consistent with a spearphishing attachment used to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=evaluate+numerical+expressions+5th+grade+answer+key PDF link annotation
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097727e5d0c9---turupodibopotosuvinaz.pdfIn PDF document text
    • https://www.shinoda-usa.com/ckfinder/userfiles/files/zukeven.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/zibubiwufog.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/dajelokawidapimikisuxax.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/90237390401.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/33447416270.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/68705558453.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b363449d6fc---24887617110.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/xufunetugamurajobibibepi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b8e020f1---jegos.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/5m2pg6n7fuk1ndq08fisgb12p7/56249559356.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/o8ql0jlf9sn5pukvsnj22tq0v1/68998654675.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608542fd5aee5---fonudulinekowobafefadov.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609973e393e60---20534537666.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/80800900485.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/wogulifidajozozajidoso.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0329e8e87---dagexekupamelosepeterum.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/10416028004.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/0fq7p6h8153u14bk7upim9ua41/68835387200.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/84860549547.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/vefujabug.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/19509492798.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_off0000e28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 11636 bytes
SHA-256: d1164cc52313da3e1d75a08910d3ba8e80bd17daca2fc5c0e5fa2dac59c4ff44
font_01_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001160b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160B 17600 bytes
SHA-256: 6805c02a1574e89dfca5ca6c9c98b77a67f58dfcd35c5a9f958b2c0c6d53de55

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