Malicious PDF — malware analysis report

Static analysis result for SHA-256 564d71821216fca6…

MALICIOUS

PDF

86.2 KB Created: 2021-09-01 23:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da1f75a30709137d0e988d84d38565eb SHA-1: 731a8cbcec0b42bf5b3a0f3ab1af2153ab93e688 SHA-256: 564d71821216fca6592c6aa19072c344727eec1759be49a802d2c525298e2bf0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple URLs hosted on compromised CMS upload storage, including specific examples like the one found at http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b45bf5a37a3818aadc31f90600367be3/67804343833.pdf. The presence of numerous links and the use of disposable hosting suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/qfn5usuq6j3rrag5o2iq073fu3/noxoragagovivumusijuliro.pdf In PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/datufopakekadeforuwiboj.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/3143298907.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/jigaxutuvelenafizog.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/450dc4963079258ae19e47dbf39bc065/57056565085.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/18928755108.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/31389788329.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/29850633769.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7af472e268---46749794277.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/68f52703ac87c0582040070c80a51c3c/lomunusidolen.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b45bf5a37a3818aadc31f90600367be3/67804343833.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/54330526174.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749236e595c---73316614272.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adabcdb94b8---xejuguleropajufagup.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca10b89425---feluzodakofa.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/c08ec922eb5e727940d4cb3564043757/wumizava.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/matosovedirijajajajuwo.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/xagokuduboruluki.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/67617337411.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/76163793264.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/faa72f29c554ef4bb287be8c5e7c6b61/gexipavefufo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f85b4e4fa---xerideve.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e720faacb0cfd05ff0c9e3bfeee0427a/38467464997.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/wenetujekufuzamibojebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+do+you+say+it+is+snowing+in+spanishPDF 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_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 17920 bytes
SHA-256: 0a571bf5cf0134b68fde2eb90933d624796762df94e9df7a7d5ea7f406971262
font_01_sfnt_off00011974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11974 10684 bytes
SHA-256: 8aad634f8aadc4724382a0bc6dd1f76a3f372d1fe06a5bc6a31545fa85525897
font_02_sfnt_off000131af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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