Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca1de44dd12b59f…

MALICIOUS

PDF

84.5 KB Created: 2021-07-06 23:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8373b2bebdacc9f6af8a7d145f1b0034 SHA-1: 0fbb7576bf0b99f9d9d1a31e8f8624cef1cb62dd SHA-256: fca1de44dd12b59f6f1c3a48c1ea24a12efc96df8fabde4162a5985a26862dee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious sites. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://parfumzone.ro/files/file/godokutebuwoxusu.pdf In PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/724f86788c393dd3cca0a0132a597454/parimelaxixasorobomire.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/b93ol1a1lnn8s0l22tt63acfsc/34446769831.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/16774934848.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/hgvdm5800t7fj89fjehcku58n7/20473999569.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c364c803a69---diligutevofemosofemogo.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/25978052256.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d26246f7c---18258250995.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///xesakakol.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lcohrd0bd8vk7b4aqj1uah10o5/gopajowinuti.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/502f2be14aa70cdd82cb241f02eb7a90/gugotijegiponavopo.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/maxedozarumewobobulozava.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093b68499619---58898660226.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/4c7361a313dc2e72eace8ed0e57fafe3/tonirejugigomagase.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac56e0b3391---labowazukaxunisaxewon.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/32175050360.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/96409967020.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/60829344667.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bdec01b24---60299111770.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/61825d9ce37eb1391159e4b5042ba627/bovabozubog.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160913f841474c---fivilonobupaluvob.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/75672265910.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/44937856481.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160823678419a2---90585222337.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89fafd60bf---mumidawuguzuxugilowozam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=coulomb+is+a+measure+ofPDF 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_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 10444 bytes
SHA-256: 9c2c5210f998efa78a0fd846fc887654bc426e81851de9f73a1da723f3bf136c
font_01_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 17604 bytes
SHA-256: cfbda61d77be4dcab4b6bb36af8a644ca4e20f4198c479716cf473330600a386
font_02_sfnt_off00012c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1