Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8198c7c47d0de0…

MALICIOUS

PDF

76.7 KB Created: 2021-08-15 08:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e64f78ef4f6b115cb873d5d4eb6c807 SHA-1: 13287ade155a5ee27af6bf5278da0dfb0d903f60 SHA-256: 9e8198c7c47d0de051e9564a154a36022addcb79110e47af8f219edf51a9e554
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary function appears to be acting as a link farm, redirecting users to potentially malicious content or phishing sites, which aligns with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/443af790c5c0be4d2b247cca423bcb21/93934010542.pdf In PDF document text
    • http://sam-global.info/files/file/56599668110.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2138a801d---zemukunugupazupuloxu.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/denajitaropepoxixabudumo.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/gevapibikabekanazog.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7js18719bmg32cbhc7fa2qncq1/49326548938.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610335e7bce15---5122498773.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/kabojomunora.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160822dbee9665---rilakitirimimexugonid.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d23e8f8bef9bec93292e72249e2b7fba/92125522862.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/jomola.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965058be8b9---35183604582.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7acd96d2035eda211dc5bbb5ff97ed2b/butokomagebezazonugi.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/32829281479.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/39977148484.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b807146d04a---fasupepejemotis.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/44207245380.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607de73d3540b---19214896575.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/c22c0dafb9f6231d986d52036418557d/52869813393.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/63837555919.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/zezezizixomamomegak.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ccffb201b240835d97882595713eca45/gapesi.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/vezenudos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=juegos+para+aprender+pa+pe+pi+po+puPDF 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_off0000c65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6D 17496 bytes
SHA-256: 678215cd25495c7b95bd464a0492fbbc42c6fb60d67cbac1eacf1cd0a3fa2c7e
font_02_sfnt_off00010a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A71 10516 bytes
SHA-256: f66360eac205f23603352f60e73af71adf35fb61158488413b2823298b0ad3c8

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