Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a06847e82485e0…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 01:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a461c4e9d9401836b683f6592f69efe3 SHA-1: 312d7694fb3e110610ebc3d2fffb1bfb4cb8099a SHA-256: 29a06847e82485e01ae328732f01f72403ab8d9e11402be793d47211bb5e208c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with spearphishing attachments designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://lanhcongnghiepthinhphat.com/upload/files/40630906226.pdf In PDF document text
    • http://rapabzenec.cz/obrazky/files/kedijizevaluz.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139193f0e6f8---16195536037.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/seruzomirekuv.pdfIn PDF document text
    • https://subded.org/userfiles/file/runipirigaz.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/gamuzomegub.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/venivubatazenixekiruv.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/xexotilevenarulufapul.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/ralizizusid.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/47791525616.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/vekiwog.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210922_232140.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/zixopisotofule.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3b474b36---42126510408.pdfIn PDF document text
    • http://mega.kz/media/upload/files/mafimakipe.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/67e5e7dfe9b693e4350d699cd7fdab18/16178894791.pdfIn PDF document text
    • https://10fci.info/userfiles/file/koguvudalobeva.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/ritajikifikaji.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/tefamevujuw.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/98064775332.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/56368155098.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/84710416215.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/bimipojutadebofiniwemase.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/guwuxugefugobinu.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/kixajumibevekuje.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/bokeseroviw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=vector+analysis+schaum+series+murray+r+spiegel+pdfPDF 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_off0000b36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36F 14836 bytes
SHA-256: afe0adacaea248ba5dc865c42d66c12232d4429c0073496a7c261b4b7f65debf
font_01_sfnt_off0000d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 11248 bytes
SHA-256: 6aa2037f8bbddbc99de68b09285b58d03c0d2a634c339317fda9e2273dfc965f
font_02_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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