Malicious PDF — malware analysis report

Static analysis result for SHA-256 2abed51bc0f3d0e7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 14:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 14a7dd74c9d99d7f03c02041f81dcec8 SHA-1: 764851186f52db99d3fdd3a24792f5809e2afe01 SHA-256: 2abed51bc0f3d0e79c7d821ef5f4acef2d50105226eb71b2c05a111b1e917d28
204 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it contains embedded JavaScript and presents a fake CAPTCHA to trick users. The presence of embedded JavaScript suggests an attempt to execute code, likely to download a second-stage payload. The document also contains numerous links, some pointing to compromised CMS upload storage, indicating a potential distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 http://lapempi.nl/ckfinder/userfiles/files/18856563209.pdf In PDF document text
    • https://aquafilling.com/userfiles/file/rowowadov.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/52529161731.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c1de83d7a2076e02d9e98de399c53690/puxalemobekeduwemunosim.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/logakagixiza.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/83799954571.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/savasowiwadop.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/93542836171.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/49612286382.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae27184c7---xatonimavegepobebilike.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/79686888144.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16131175879b27---4763246032.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/fiwopupusoj.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090619584073499.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4d980bcd72a9f5397e6b7401368376e9/siwavevuj.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/87234117935.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/62491652032.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210905/210905155833632464e8uug5f6fekt.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/zadexufoliguxugewuxobo.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/bixatoneruletadaturud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ml+moving+wallpaperPDF 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_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 10472 bytes
SHA-256: 59358c58a63869f09203116d8c43312965acd1ad1722256c6e8355e78ec638d4
font_01_sfnt_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 17984 bytes
SHA-256: 7d32708d532667ba9b363da53dcc399bf7e2345d296fa7ba9a18ba8172492361
font_02_sfnt_off000121c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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