Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bee186cbac3e65…

MALICIOUS

PDF

85.0 KB Created: 2021-06-26 04:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 741b65d06397d9a3db5574fe3fb54d8f SHA-1: 1c59d73690045ee5eb280a97104d312184a11bb5 SHA-256: 64bee186cbac3e6518388eb9f36d2d6f5150e54e16a8daaeaa12ff161f54206d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm on disposable hosting further supports its role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2df25d332de253e51f9cdb6a205595bb/vuduxikegopoko.pdf In PDF document text
    • http://sushi-belovo.ru/files/20911994360.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/doluwelin.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f893fce4a6b6f08de393e780aa6330a5/25762193589.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099710c1a4bb---sojodariw.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/da8obmj29fge6n7a7g78ckf0ch/lujunemudopar.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/rapitizejigovoxikofad.pdfIn PDF document text
    • http://24cvety.ru/upload/files/dejugitujaw.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609284fc6b867---82097512661.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098317a17349---82519600698.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/58058602334.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/58032c1d419c7e030ddf27bfb186b08d/xixarewogafawaworuve.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/mujanaxedabifubimuvixona.pdfIn PDF document text
    • http://texmet.pl/userimages/file/68779185095.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/43la30188ho7eo5ujfta0afsou/19787385196.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16099db389521a---sibotinebuli.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1624592749.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44e9d6db3---94758572108.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021618155505782.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aa97a8128---81240392785.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ccda1aff6dd9288ef2e7d3e08057fbd9/61966122594.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210625_231246.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9403c5ea86---28996688085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=layers+of+application+architecturePDF 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_off0000eab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 16672 bytes
SHA-256: 70a99839d11c9c55f14da68b7aa5e22d8dd2bf1da757d06cc95e026b526c4a3c
font_01_sfnt_off000115dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DD 10748 bytes
SHA-256: ea64942d632fc65050db9d9def8b22b3c59e5a901f2707fc0b9a167a357907cd
font_02_sfnt_off00012e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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