Malicious PDF — malware analysis report

Static analysis result for SHA-256 9404ccbde95ad27f…

MALICIOUS

PDF

125.4 KB Created: 2021-07-06 03:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: eab69e8388f0d180f8a7bdbc8d7fc9eb SHA-1: 95b97f6b1469cfbae320b37574e13791aca3eac3 SHA-256: 9404ccbde95ad27f9a76f31244cd749b3c97f434d17b0e66a1b799e724a007a0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised CMS upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL analysis point towards a phishing lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://skogsformedling.se/bilder_umeny/File/kanusogikurizutifadubo.pdf In PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/79122599148.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/etodoparajuwaboran.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/45171657842.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/38694622204.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/ponibukenaresawifafa.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/vejijigu.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/49274694555.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/v8pq174kfqmdagk71o64ou522c/bivoka.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/tilaxuwukiginuwuzaruk.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2628b225e9187c2809574aff840dc039/38012284494.pdfIn PDF document text
    • https://sbufficio.it/file/fopabipebi.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d4a7e6104---vazonilevuwelojezudejeti.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/sbsho3ptve6mg211vin1veakm4/42876137192.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/17e043de9a2d03c94307dcf97f865f5f/baniniwosubaladujaguba.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de4225644e6---sazib.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081579224538---3788315298.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/c1e4b1622b34f7e8126faab6c4c6464d/75014192164.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2a3d60a8---55143932532.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4ef929f7458e9112a0bba2fa1deaf666/ravametuziladumisiripa.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/21d8491db68d745cf2ce8149501b47cd/bomudobizixaxil.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944fdd94a6b---89550769820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=important+questions+from+physics+class+12PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16991 11228 bytes
SHA-256: ae0355d9f5d97bba4fa9ddc9d859fde87a14ad395586542d3c025b30fdff4558
font_01_sfnt_off000183cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183CD 16192 bytes
SHA-256: 35be3cbc1b0a880c7054e0bdc8975c27e8c66d96161107ab77a59fea99e90626
font_02_sfnt_off00019969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B17B 19928 bytes
SHA-256: 590bc11cbca2b04107d751afa31a3430646575d1c2ca6e99d8e27320cbceacec

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