Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cde4a680397a83…

MALICIOUS

PDF

67.7 KB Created: 2021-09-17 01:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f1f31a7f581e85ab28622d28d5f2627 SHA-1: f13c9658667ea1c134376105263b7fc0d19cc992 SHA-256: a5cde4a680397a8306e3dfdb4b12820058dd54a9afc380d6e06f42acc57a9921
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. The heuristic 'PDF_IMAGE_LURE' indicates it's designed to trick users into clicking, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics confirm it hosts a farm of links, many pointing to compromised or disposable hosting. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/4231244640.pdf In PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/rkrgs4uvq2uuj41hogoon7h2bi/vupunepanubi.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/92527779784.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/19810804340.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/dabobobajodozimurudovisen.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/tojufuperadasa.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4d825f57f---69872125677.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/bedupaka.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/13439183074.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/vuratubideda.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/89359925637.pdfIn PDF document text
    • http://coumert.com/images/file/gibab.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/gofawagixifi.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ada37a4e3e234e780739f2b2ebb1c79a/vuwirijozixuwewikexetejuw.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/polibubevotewo.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/46427545899.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/nuwusakijerum.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/87747532393.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/xolijexejumolosazizak.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c1f844503---vojojekabudiwizololimuna.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/sekarawo.pdfIn PDF document text
    • https://congchung7.vn/upload/file/vorepaw.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/22407607391.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/jenuzut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=enemy+strike+2+mod+apk+revdlPDF 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_off0000ae57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE57 10928 bytes
SHA-256: 12dba7f73bd8b7c19b01581d62cb4258037783bc1f69d28a827282cd6fa6b4b7
font_01_sfnt_off0000c7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B0 13488 bytes
SHA-256: 0b4c5178140963f2cd760c5f07fe0063949f666ee47f3b460a3813bbbf4c895e
font_02_sfnt_off0000e920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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