Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eeb7457e583a9d8…

MALICIOUS

PDF

77.6 KB Created: 2021-10-05 17:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8033f59d2ee15feaf049030f79305a6c SHA-1: 79db6aab382a6edad2825a746ec28d6ec7fc61df SHA-256: 4eeb7457e583a9d80ae954fc5b7b18dc46145209a69ff19a02238f582e73bb0e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised websites or domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and compromised CMS upload links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://philabc.ru/uplcv?utm_term=voodoo+shaman+lords+mobile PDF link annotation
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/janomowabi.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/43259306796.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0bccd2e1b99f7bfcc2fae71ec8c8d0dd/13357431705.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/36253602464.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/danujidexatepuganafuxamap.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134a26aeab68---11279124091.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/repevafawifizuvobutamen.pdfIn PDF document text
    • http://krzeptowski.pl/file/lafuwodosoloredurafusux.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/994393568.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/wilamodoj.pdfIn PDF document text
    • http://abwva.com/uploads/files/bemofigizolepurob.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8a7b03788---50681946437.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/52757932881.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/45905460654.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/kigebipegazijezexamolitip.pdfIn PDF document text
    • http://zgic.ru/!upload/files/pajex.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/99856681798.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/luxunuvatale.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_off0000c925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC925 19064 bytes
SHA-256: 66091b90104878620337952534700b1389f7e586a7c03471577e74c7c1642fc1
font_01_sfnt_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F4 10524 bytes
SHA-256: ce0f734ccc4501e88650aae555c3471001e3aeb163b58c6fa65c26f3237d245c

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