Malicious PDF — malware analysis report

Static analysis result for SHA-256 8002371f9c31ee52…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 06:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f9edf547140b8f56812f86d95207235 SHA-1: d6b4285c8db338b22feb0142dd376359d3d5d614 SHA-256: 8002371f9c31ee522b5fd35478a8af62d80a404426e51d15fa809b7ac488d2dc
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites and disposable hosting domains. The high-risk heuristic 'PDF_RANDOM_URL_LINK' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The ML classifier also flagged this PDF with high confidence. The presence of embedded URLs and the nature of the linked domains suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/uplcv?utm_term=comet+august+2020 PDF link annotation
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161410f8ce07ef---38359278848.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/42934916939.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109090929176303.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/57090241374.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/poperiwudotebapuweravede.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/h7ge9orhibe3um4stc3opf824a/19871278084.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/15924354903.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/folaki.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/xewakuborekadop.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/zosexajigebotejedad.pdfIn PDF document text
    • https://gulamanis.com/contents/files/suvuxipixejukubibasurodit.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/buvozuroji.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613cae01ca01f---84057708144.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614280b1c321c---nanelolitisodukef.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/waxemetepupuganorimi.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/nilavamudugax.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371b691d7af---22932922827.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/nm1sk6g1bmlhbklg14a1ta4gp9/63632246997.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_off0000d936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 10480 bytes
SHA-256: ba2f5d3c0cf35adfb165e8d2f7a4f89fcd8f0c4d9db4b96d5a38ffe033c5a782
font_01_sfnt_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10949 19096 bytes
SHA-256: 7e85366dcf69876a7b2303371b89d4eac23a7b8388fa8fc790da32292285a837

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