Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ac9fd9811e0dec…

MALICIOUS

PDF

99.9 KB Created: 2021-07-23 01:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 91d0f371b1c6e322da6d59ba53a09b10 SHA-1: 74240ed2556419360db61ead87b4307fdf04930f SHA-256: 57ac9fd9811e0dec15a4706856f1e090ea43b1bba3f8ea0a75ea063c28f02e30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, directing users to numerous compromised WordPress upload sites and other potentially disposable hosting domains. The ML classifier also strongly indicated maliciousness, supporting the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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://www.pirkitpadangas.lt/ckfinder/userfiles/files/sogokodivigibo.pdf In PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081e6ec3d348---25650415641.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d993b550c17---fuxibelonapebiputirajos.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d39f3575544---16557228203.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/84188586134.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16098c2ba3be5a---nidoto.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608586365155d---fovojulirosegagawupu.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1e6872db9320616969c1413642bc33c4/powonopulezawat.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/076593f32fd4367686bd4641dcf921e6/13513634799.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/64780826234.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b333691a6ebb8d58d4bab53ee715078a/28817963271.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/202mkmdae1uo9hl1gmofh2pert/kidefolabugaba.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/2v84a05s4gpo2fjpkifu1u1vt1/70566215970.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210722195120_NTQwNzYyNjg5NDY=.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mvkkd4j1m91qcstivkrn55oart/nizutipixodobazexof.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b834434ff7f---kemufosimanazowijupokar.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/popudulakumitilukug.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b08fc8670ae---47257515571.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083b0f1be631---bovomik.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/madidisuwe.pdfIn PDF document text
    • http://btfa.tw/upload/files/jafumopexasutamuwudisa.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/lolosuxotap.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d3dfb4e94---fivok.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/tipavivifan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tepid+in+a+sentencePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00016877.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16877 16572 bytes
SHA-256: 7f2cc361904d402ec3513fc0018afd6795f9f810d17e59922a2128c99e358b0c
font_00_sfnt_off0000cd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1A 20128 bytes
SHA-256: 260ed4a476b01ae0cf8b66daf5a1deceb490d8cd8e1a54fd6eb37b07ae473593
font_01_sfnt_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 10204 bytes
SHA-256: 1af668da966cf3a52fe49a66f42558429e354d8fe3b9f36e2bddf4ac2b6b0ba7
font_02_sfnt_off0001165d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 19256 bytes
SHA-256: 5baae8c8524315fa622e410d0fe725546da0b89b37df9fc9321d73341e345913
font_03_sfnt_off00015066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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