Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09b02c759d05ec6…

MALICIOUS

PDF

79.0 KB Created: 2021-08-22 01:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1470c7a4982a9f48209d9346cd7f200c SHA-1: e3ac999344d01717906a20a587cb7d95cfbf5d08 SHA-256: a09b02c759d05ec6a7de1ae2ee63cc696b574b177df796fbdfcbce1969471335
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to serve as a lure for further malware downloads. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the suspicious nature of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://wastran.ru/uplcv?utm_term=negocios+internacionales+ambientes+y+operaciones+14+edici%C3%B3n+pdf+gratis PDF link annotation
    • http://lubrifianti-auto.ro/files/file/dibafebebaturufurejo.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d240a452ee1---64657170466.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/doxigitabe.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f1cdaa00---66467680342.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/mugokegokemenijukisizike.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a14b18bd7a---tejixojezivemejasudabu.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba19f22d566---44326228501.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/28721903543.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/dajokinudiwanuzonap.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/tovononawimokejowuwu.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/narinulasijunu.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900f576c55b---31631625022.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dad9c14b307---faxusolabudogebo.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/jkjei3sgbv7oq1rl749mr2jq7q/xemupubozazoxarafor.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/gisavigag.pdfIn PDF document text
    • http://teplospectr.ru/images/files/joregovopanud.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/97200463624.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090cde0b19a2---2555806644.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/39b95b9e600c638aee482e44c3b79f4d/vokiladuxuvez.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/46436061823.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/saponapekanixoboba.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742db8a93c3---daborunula.pdfIn PDF document text
    • http://martonelektro.hu/files/file/raxumim.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6c08c927---80308548405.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/01028f8c16155500365dcb75519e8590/7058226608.pdfIn 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://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_off0000c95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE173 11460 bytes
SHA-256: e0e25e636cd9b760fd4d768d1db053281477024d138afdb69c0b2036d19a3f7d
font_02_sfnt_off0000fbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 18256 bytes
SHA-256: 17ba8dfad26eeac8e844b317b4d48a485468123b123d0db5615c28dbdaee073e

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