Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ce5fc6c20f23681…

MALICIOUS

PDF

99.6 KB Created: 2021-09-08 10:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e074031bb2c11b0923e1f5f9df388a22 SHA-1: b2c976ee9d309a43f2df379710e5c4751a669a9b SHA-256: 0ce5fc6c20f236817f3e250bbb6d57592e97e57b6a121d79f47247d8c9a9fa98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content, such as phishing pages or malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=teaching+demonstration+evaluation+form+pdf PDF link annotation
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/r8bq37ae5efjp4upsl1o3fb06j/nekavedibigob.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d4745f909ec9de5758b73ad180717b65/79768498221.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/54135655526.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-8-16/20210816121053871975.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0409688001624913186.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841d0fb5e4f---tajunoweziwudugenatime.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210807232707.pdfIn PDF document text
    • https://parkettworld.com/upload/files/74709413492.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/40809089729.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/51648041922.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/18251514951.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/67c1f585b8c78c608a4463bc41407306/69003014303.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/pudimazefutezad.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085261adb6f9---87194637224.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/74183961202.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160744194ee19a---bakemodekafakorom.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/20219864240.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d98f113090---50771641611.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/tolobep.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe19a01bd73---70618542992.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16114f34a1abfd---16046158935.pdfIn PDF document text
    • http://contextuae.com/resimler/files/jivexibapaja.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/wifazejezox.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/gibuwo.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_off00011f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 18200 bytes
SHA-256: daf6f48dee11daaa4d9be5b0129e57b506621cfeaf436d597c96763a0f878908
font_01_sfnt_off00014ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166BB 11196 bytes
SHA-256: 823d64337aa716086c9af82006bb01f94f371701c54c4674a5310983307c0e4c

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