Malicious PDF — malware analysis report

Static analysis result for SHA-256 51987964fc51e86c…

MALICIOUS

PDF

75.8 KB Created: 2021-06-12 08:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fec4f19bb9f97c627ece5166b87e4ec2 SHA-1: a55fed1d76a3c005bf59f039d7517be05ccfb58c SHA-256: 51987964fc51e86c6b2d8cee785973b15b9a859ee4b0ddaa7554ea6574b2eb67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is classified as malicious by ML models and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external sites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to distribute malware or phish for credentials. The document body, though heavily obfuscated, contains text related to movie downloads, likely serving as a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=shaadi+mein+zaroor+aana+full+movie+download+720p+123mkv PDF link annotation
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/126uh4ml129euo7uhgsitjjj8v/86635499747.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608afa10ea3ac---88888443804.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160703fc34b286---fibelanevalufasuvoj.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/nonakawurosakezu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jo8qspuj29kvi40sntim6k56b1/22686668727.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/83855613277.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd793f1402---81339833302.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a4917b462---bejevoxorejiw.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/17294706611.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071d77dc63cf---buzegosurezafuzo.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/8dheopkkhvbn8a3hklcdgtnnv3/zogolugodafipogorevubepum.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/r2n62jgsmijm8i7plgd0hrjgh7/17905755018.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/fa1d8080b7bc0355e9bba8774998bd0d/zobugobivafumerodazo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/91f019ae77b768dd093d2165d666caa8/nuzat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 6040 bytes
SHA-256: f7ca2b077462c97f80d20e21130b915897bf61de4944ab48fec3db280babe328
font_01_sfnt_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 10964 bytes
SHA-256: 597c549d9eb97e7c1c7a2c5bc483314563ade758e452ea6e72a06eff3aa3074f