Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f723eaa5bb64cd…

MALICIOUS

PDF

95.8 KB Created: 2021-08-19 21:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8e2fd1b7d73a566d4ff573f2706583a SHA-1: f012ca917b145beab15c9eca0901dc3510ed8515 SHA-256: f8f723eaa5bb64cd863a0812e723cab07fb9fb4cd16f89359c0db8e871520aa2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malware or phish users. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the links point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/q04lcv9a9l1qm8ojosjr62393s/lewativef.pdf In PDF document text
    • http://csim.jp/ckeditor/uploads/files/teseligirujot.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc5b704eb9f13680014be7764502e270/wusigizejipeli.pdfIn PDF document text
    • http://kbchina.de/upload/tivadodadozexadiwotiwojav.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cd9b40609a557ca3e2f61739908d3ec8/mokemanamevorikovuvemi.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-18/20210618073227320719.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/tutowired.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/1598086517.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95647a1f40---fuvimasavexekogo.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/66355114097.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/p8qurg67dmpngr7kpeqjttrrh1/80082130373.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/5892074039.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/31025735516.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5dee8840600847b8dd859897f328de16/19989575256.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///96685641184.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090947df1b84---16357832480.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/i8jombtqda7nhtveuombhd7192/duvuwuliwav.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/lifofuwuguviriretagetotov.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bcbcddabe---medavidufe.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mowekesuzulize.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb684824e---55438291081.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b59710c9---29377149329.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/riropuzofezurabu.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/4716c557d9bfce2f79fa74be84a55230/20208688204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=planner+5d+cracked+app+androidPDF 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_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 17872 bytes
SHA-256: c9772d095d061d887af19ac33eeeed178243133dc2f79e36f45421f4f0430d12
font_01_sfnt_off0001295c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295C 10468 bytes
SHA-256: d1089fc504e0cdfa440561e2d7794a9cfa743a555820d8f8a6787b80e6a29852
font_02_sfnt_off00014133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15944 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516

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