Malicious PDF — malware analysis report

Static analysis result for SHA-256 85af26c9175f102b…

MALICIOUS

PDF

86.5 KB Created: 2021-07-16 15:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5f1180081d7478766562ea3c67d7e56b SHA-1: 7504e6a423698d1ea1fa5c271b4f0f9ccecc3669 SHA-256: 85af26c9175f102bd2272cfb09202da2d6c220b2e498310adc01ee5dd8b87799
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a deliberate effort to create a network of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://wallsfamilyreunion.com/clients/876683/File/93766524853.pdf In PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d2eeb3bfa8d36073d57d7cb010bc185d/57588646033.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/rozug.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/11170555566.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/p01itech29jp71b0tivd3l364l/wuvoxiziniwobik.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816cec4a3d1---4148954710.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/bopafalegomajulitotuw.pdfIn PDF document text
    • https://motacademy.it/file/gegixakigixaj.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0bd9e6390134437e8a39cca6008e7bd1/lalezogan.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/93956153080.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/87296648655.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/33172815678.pdfIn PDF document text
    • http://adveotec.com/img/file/62217621045.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/fikuwuriladariguwarejagot.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/32941053993.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/6pmm0m5ui7pvs5quqib8c148pd/befogosebevamubixakebunaf.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/3a768b1e98bf5b8c580dceadfcf3ac88/60180261409.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/bc065a1c7d3cc5de4161f4c7a9642faf/dabenibi.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/af360f5936a90a4b2fa179ba2cdda0f9/rokixir.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/76185756678.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/dekexowizirerelazu.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c7336bc952fd175b1d7ca99d77582ea7/lagoziniseximaxamowuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hockey+rules+for+beginnersPDF 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_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001097a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 10688 bytes
SHA-256: a317c7592bb274dbcc3cd3a3437bfba2c82da48eb8d04b5407c81809e5214157
font_02_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 16420 bytes
SHA-256: 5f1920aa838a9a1465271b372cc47d4a93bc36cf018b78dab43593e0b5465add

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