Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0d829f5c55e09e8…

MALICIOUS

PDF

89.6 KB Created: 2021-05-21 09:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 585a696484a2e37c30c8bb40a2c83e34 SHA-1: 69b9d1676219c74311b6aaec17aeb9660b374204 SHA-256: e0d829f5c55e09e8ecc48455137918a6a0a5887ce7c4d88a01f67e64f8dce31b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9410

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://laborke.ru/uplcv?utm_term=ncert+class+3+math+book+pdf+download PDF link annotation
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893160791e4---53736052148.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160779ebb13b2e---palivimuxagomavagazip.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/65221124962.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbd1405c11---zelusaxanavukafunoju.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f20577eebe---81692614293.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/63995479329.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/24gj2djqrk9bu5h6gobh1e22gf/21784473788.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/xerebepib.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d45dfa99d4---fazefo.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/fe55934288ade33933d4ac45ea1ec823/zoguwipikuporavefiji.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/q6g1pshu6j5331v1bap276fk13/45097394066.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7624aafc3---fivipopuvejefumumage.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/311055a0a9bd10b410ef0772c5816c36/dozujokusorodojad.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/df1e0c299ccc6de980b47cc501f364c4/wegifedutasobonokagox.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/c496333d7dcd690d8723d58c5c66085f/55554591757.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/65151987992.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608008c0576db---47816586888.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f466f271ee---petogaxotitagu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 5824 bytes
SHA-256: d929dee1c7b51477e4ae054fcb5346fb598b793d4ea570fe8990b649ce3d3be9
font_01_sfnt_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off000114ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AB 10352 bytes
SHA-256: 5f620e502e72ded67c572734cd4004dfb4dad21d82efb6d3efc74ab31bc6c4ec
font_03_sfnt_off0001384e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384E 13344 bytes
SHA-256: b181e0ae8d6b42078fe78d83302af4ca7b9deb5530787e79a9e513e4c25f7a1b

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