Malicious PDF — malware analysis report

Static analysis result for SHA-256 95036892e63a8f1b…

MALICIOUS

PDF

87.7 KB Created: 2021-09-03 23:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5e9859130a04686651997c3a44bbef95 SHA-1: 103ccc25542797755b983c4de1b02456999a6039 SHA-256: 95036892e63a8f1ba87d9463220a487b97be1a09f20e89ac6b8cadaf55a8c516
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and the ML classifier also indicated maliciousness. Several heuristics point to the document being a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs are likely part of a phishing or redirection scheme to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://kiuruvedenlukio.fi/tiedostot/file/lelebewuketubilosozezizex.pdf In PDF document text
    • http://beepost.vn/upload/userfiles/files/kumifizukodaxavokewef.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/ronagekodokubo.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/23817542875.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/nulaniruzizabuturujomu.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/mevuvesenepipujusoloxeko.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f236665ba7---tawezagelep.pdfIn PDF document text
    • http://atek-ent.com/upload/file/97097644763.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/55b845b872991b3c55db97ae0b83d693/35772142079.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/9a9f22394b40ce00f3f825b21a86ea8b/84931334351.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/u9t5hgs883dk5e053au2lbjhda/68342841075.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072398933d2a---xenitajarorurug.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/navuwuvirova.pdfIn PDF document text
    • http://abpaluso.com/upload/file/ranejoloniwajunuwefebato.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1d5dd92ed---18118986098.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/ximixekisurulaluv.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/29717491830.pdfIn PDF document text
    • http://aweibel.com/Photo/file/nijobegajasumoviviz.pdfIn PDF document text
    • https://hssanesteban.cl/files/lejuxeruxizavugedago.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/tidumalafomuve.pdfIn PDF document text
    • http://jinyezi.cn/upload/mebegijelekakanemot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pemeriksaan+histopatologi+adalah+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 16532 bytes
SHA-256: fc69200c8cee6c51e53370c67afcc1d52bc0cb83975b868d45dd959d9b109cb8
font_01_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 16892 bytes
SHA-256: 7bb558c053dc4e043e6ec2b99395c9865f054a5c24d8cc6c1cc1224a35179b35
font_02_sfnt_off00011f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13741 11036 bytes
SHA-256: 0ed9fd9ffe45152a6ba25e36c6a42eff2d755f502b54070efac772f042e01c75

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