Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffe1216d904e290…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 14:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f66d908eca7b0e8a5239ba0b3c8cd24 SHA-1: 31f04ba782414f9c362e76e72643796462eb0787 SHA-256: 8ffe1216d904e290bb8071b394f6c1f888cdcb301b1b77af17a22814e7a3d8f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it is a link farm pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of numerous URLs hosted on compromised CMS uploads suggests an attempt to disguise malicious content behind seemingly legitimate domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/9rkufpc5h813q98i610gs1sn2e/tamilanulizep.pdf In PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/fce8d51a6219ee3f2351cfa9abc4670e/58005424033.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/jhjf2nm2ka11sea13oufod1g5m/vivutamomugesup.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/9204989115.pdfIn PDF document text
    • http://prosquash.by/data/forasimepatijumi.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/5f9b45350db048a8da5f6314c22911f6/74615707124.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2be257dd0---91374843758.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78826499bb---80160523080.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca6c7848e0---46505133763.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a39b810603---begujalumele.pdfIn PDF document text
    • http://sakem.org/userfiles/files/39730252009.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c691aec608---95980182939.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/74a9e0def5334b23413b4f1f530f8e1e/pujade.pdfIn PDF document text
    • https://renetravel.ro/images/files/94736055965.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ea05bab6---88056441856.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/dejuvalisotapufipuvalox.pdfIn PDF document text
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/jokumomusajederuto.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/19967573312.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3645182b1---nidagasazusuzenafo.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/280023195.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/mujorajizulejusinu.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/mizizusoma.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8366a5c95f---4473791395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sap+technical+specification+document+pdfPDF 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_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 18300 bytes
SHA-256: 2f1274de1a20792cc4a26c982611bfb7114e8d5e0d2d4b6ff09fc547e9623665
font_01_sfnt_off000118b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B1 10960 bytes
SHA-256: e9d59de62cb2c25b825552168679561e38f95492dd2281b55b3fbfc64d6b0277
font_02_sfnt_off000131df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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