Malicious PDF — malware analysis report

Static analysis result for SHA-256 024524a0d7dd1966…

MALICIOUS

PDF

75.6 KB Created: 2021-09-24 08:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f68caf7d3419b725d06f3557aa37657d SHA-1: 27b7041fa4aaffd70176c46bf208a4ad430f461a SHA-256: 024524a0d7dd19666d1a396dcc505080716d1ab8953d761b6ae22d88e3c20c8d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to phish or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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 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://strandedtattoo.net/file/tuzivulupebokuzokene.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a2899841f62ad864d5a7f6fb3681e1f7/65711961258.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/bifalojerapubiwaxup.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/wegosufuporumi.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161358147691f5---29467284832.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/degaxivo.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/wopebuderozuka.pdfIn PDF document text
    • http://prompol.com/media/file/26112429895.pdfIn PDF document text
    • http://lawngo.net/fckfiles/9014812181.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/debitada.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210909115557.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/78435016890.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/desofuxiwapebomugapumuze.pdfIn PDF document text
    • http://kite-surf.sk/files/podawuwijikuk.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/23524714608.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/39480118659.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/ritixodekukume.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ghh7ra0qj0q1g4hiqau1r4dvvf/kijubexupo.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210910071732.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/52898903666.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/68593670767.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/28019785036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=suicide+squad+tamilgunPDF 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_off0000c2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D9 17604 bytes
SHA-256: 950de6b6485ca1edf56447082472882ac63a00e6733b7e29720c15a5c09cb9ee
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 10816 bytes
SHA-256: 8690f2192625e2d1c8ab209d87ba4bf7e9dfd369d9bb3480e1fe4b501194d573