Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82d07d05f437d1b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 22:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bc0b857eb2cbef61197ddfb0bbf5f569 SHA-1: 28d3c5d25a4c3825ff90a711d6c9f1041a5fe588 SHA-256: b82d07d05f437d1b98c22a82858da8c81c8e790244af909a42cfc1f60700bbc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms points towards users being directed to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://joewhitefamilysite.com/clients/59967/File/22763121325.pdf In PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/kumapenati.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/0rh0migeqnliuo0sinf0u8h5eo/dijolamovaxi.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16126e775668a6---78809301714.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/39068138584.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/watozemipab.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/64685762345.pdfIn PDF document text
    • https://dhesient.com/media/56137836318.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/ledekafovoxapikezoje.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b7fba382f94bd4ad197b00b571cc4655/tiwuwowitawog.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e37b55f22---24919007522.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/3433840cf26ff3f4f5a12a7f1b570631/88891097481.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f95f29893f---nezudajerusugup.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/288d123a1802566d82c16eba1e7c091b/lugeropuxelozadegovuram.pdfIn PDF document text
    • https://2acontractor.it/images/file/3990133136.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sinasukewagudaranadum.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee182a9de0d---femubiposiwimiponitamiwix.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc816da3f2---taluzawadamajafojetuzusok.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c115a2dbf---xilanazibirogizogifiwivu.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/sotezu.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/1624c3e5ba8d8216c1f88cc0b0f527d3/gisov.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d414a2e43d---kizuzaremaxababete.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/zarikonevivixizemoketisu.pdfIn PDF document text
    • https://negaratoto.com/contents//files/lupixuwenin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=human+body+skeleton+worksheetPDF 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_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 18432 bytes
SHA-256: a74e7c317981eb8808d38f3d72a2733a2ca5e38a2e838a0ca9102bb428f7d372
font_01_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12688 10944 bytes
SHA-256: 0213344eba39b575ec6c3279358b06a6106444dcaea0b4b822f16ad116dc0c84