Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcaef89af927c5a…

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 22:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f15b74d17298cee13084584ee1d030f1 SHA-1: 438f2b18a950d09d1a54a16ea7a949c885303be5 SHA-256: ffcaef89af927c5a10d7dcd83d6116beea27b1dc0918c5da9566f51ac25073fb
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and presents a visual download button, suggesting it aims to trick users into downloading further malicious content. The numerous external links, including those hosted on compromised CMS upload storage and disposable hosting, reinforce its role as a lure for potentially harmful downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=s20+launcher+pro+apk+download PDF link annotation
    • https://alamansyria.com/userfiles/file/xiduvipitu.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/savevamujudotorezuwesora.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210909203553_wf631g.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/26485480527.pdfIn PDF document text
    • http://ilkemymm.com/image/files/63591287733.pdfIn PDF document text
    • http://julianina.dk/upload/file/fupekewewukoritaji.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630981842.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/57212891844.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/65184966065.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/gemejakagatosiliduwes.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/1768221513.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/jejemasuxebukuvaxujopan.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/43133113004.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/25905181337.pdfIn PDF document text
    • https://aleemanschools.org/userfiles/file/77233109055.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342508ec2ca---xonagizotaxufuzelovogago.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/f7af6a2438baefccf5f74fabf30909c6/gojemenewijopafubozexo.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161415fa07908e---mavetizuwozobax.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/mozunibajefaf.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/pusulujobezola.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/92191514773.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/dobubejafowibetewub.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/nitetijoxironeja.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/dofarimosuledap.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/10858177551.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/59534656476.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/walepulepabobura.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_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 10848 bytes
SHA-256: acaf7f4ae5e6563e9f04414d3ec1a237832db44682879e6348375007bc856dcf
font_01_sfnt_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 18400 bytes
SHA-256: 988412ffb84226128ec3c7f9cda1614b92369e993ba4fffcfda98e3c0d235eaf
font_02_sfnt_off00012ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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