Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4beb7405e0168c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 10:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1ec2ff818463f8d7ecd1485661bc52bb SHA-1: 28239a607494722ff625086bcafb1c08e853352e SHA-256: ae4beb7405e0168cd4e6cf92eb852d92d0eb726540593c66c39e7b8ddc97bc08
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure and linked content point towards exploitation of vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=sdgs+indonesia+pdf PDF link annotation
    • http://sattosushi.com/uploads/files/xedobipuxezafudebosiga.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/dunilugojunuki.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/77845957314.pdfIn PDF document text
    • https://securitydm.com/slicice/file/zirorukepifefudaripemuku.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756678cbc17---togizegisagewimowevu.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/vepukigaxigu.pdfIn PDF document text
    • http://pasted-radio.de/web/files/xotekajizufopim.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b3c5d80c2---lotuwawajudariwaju.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838c5a13689---31400956360.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210820_13511524A20F8854.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/jometebabugo.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/gowuma.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/tuxivakediriduduluxom.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ef02b5ddd---9379326517.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/69138d3a38d1d2f5e5a64c8448a219a9/xigadefazozolenokerep.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/6o5mqlknpm3td8tmqk7o9rt64c/10910337306.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/susot.pdfIn PDF document text
    • http://na3.it/misc/file/bogewurom.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/kuketifatoji.pdfIn PDF document text
    • https://abeess.com/userfiles/file/gowabativemumarovifa.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160729d36732d1---12957036021.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133252e1f326---82578347454.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_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 18552 bytes
SHA-256: 066224c7340ff11302ec738d3ae551bd544262ec5af4dfadb4d10135d9a0c046
font_02_sfnt_off0001254e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254E 10504 bytes
SHA-256: 9f8005f5254edb1bd82f11955025ae416b923646daf8e5b512c906d719406baa

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