Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66b1e167dec31a1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 07:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 54eb8d525a5a7a5f302eadf11e032e35 SHA-1: 19a5fbbcd914bda52ce70ad3b0fa2dc7f2462d27 SHA-256: d66b1e167dec31a10b77e7b5605528f85e074c09e01615a38316be5e155ff80c
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pmsp-me.com/userfiles/files/misokojevunubodatugivid.pdf In PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c667e57b20d63b6f091aa4618412ed9f/18762534656.pdfIn PDF document text
    • https://blokhol.com/upload/files/wigosatasof.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/sowumaramude.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161342870a519b---migowavigolekevez.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338248bc1bb---nesofur.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/40703061118.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/rateruvukip.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/wewakigekes.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/be1c7e6f29132750ffd0b9ab5fc232bf/zenilopemorarodinoze.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/famebazoletisi.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/pakuwitotugupijukikuxa.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/nelatusolezipo.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/lemavewakasinivonaresazub.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/kusegefilogolonetajigure.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/wulamemexikananewubolun.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/60241769004.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/4997811078.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/r978p7h69vkkovpcl0k2q7bo7r/97351293854.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210907_EB24568F1F2B2E54.pdfIn PDF document text
    • https://satesayap.com/contents/files/punuvabademesivofegesan.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/sijasexeperirarid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=adblock+plus+premium+apkPDF 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_off0000d203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD203 21524 bytes
SHA-256: 0c6b99a3f5dfe455b38e5cc665f8c1069b2e7edb32ad9569409bae8ec2677fac
font_01_sfnt_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 10784 bytes
SHA-256: 487c16b2a15d5f492203ecb7251c2f2c273d7c240f39a006022f6f2bd24f9ece
font_02_sfnt_off0001231b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.