Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ab73a9c14aede2…

MALICIOUS

PDF

70.7 KB Created: 2021-09-08 22:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 247e8af6cfce893685bc1ceefb0dfe4e SHA-1: 1e73d17da850a71c0b916b4b33ca88ba9ee11056 SHA-256: 53ab73a9c14aede24bae959473fed3565f2171bcf702d59289f2358ee9307996
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=animal+farm+pdf PDF link annotation
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c3ff08ba1---85222676074.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/bf72a256331c5b5a151d6d2c1ec81f09/491836382.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/52599234681.pdfIn PDF document text
    • https://maisonforville.be/documents/file/dojubuvenugiva.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210905_091156.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/b7f94fa2beea9eadd1347c76b0c77410/kokefoga.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/koxulufisira.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/90100024575.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/fevedawigujajuserorugi.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210906193448.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/janizenudotuvopuz.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/wufarajeme.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/vedutolalesevuki.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/eca2db5d18319f0767a1a6c9b984aa28/rufaz.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/kezarumipinewumorekovuvun.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/xoduzefefopuvufamewonab.pdfIn PDF document text
    • http://trovas.com/userimages/64402537216.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ab8a69870c3be73ab6179c83e2aa303b/64963487422.pdfIn PDF document text
    • http://klinok-saintp.ru/files/gedakudopupazegefimuga.pdfIn PDF document text
    • http://ttc-investco.com/img/files/59148963157.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/87294731651.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/japaminawifiwokoliwidosud.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cbe6553442afc7d4b863f20b1bd83088/xidokemugodejal.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_off0000b6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E1 15824 bytes
SHA-256: 25b99780c23de6352f6bd7f31a1e1a14e144788f502199ab2e8b0f090d05ff95
font_01_sfnt_off0000dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 10124 bytes
SHA-256: 25adc190a6b7072e67e5fbb8b23e5382df7313357ffe854280c4e10ceacfb2bb
font_02_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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