Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd53611a5bfe94b…

MALICIOUS

PDF

93.9 KB Created: 2021-06-11 06:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 06ecd94d1271494d44adc4cb82286b5b SHA-1: 21f01d4f4c3dcca4afa6c43bcb65fde8f7b91617 SHA-256: 3dd53611a5bfe94b413fde0b46b2dff4aea0be5aaf7bebfc1b2b4d02f57d00d3
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body's title, 'Why is my heating pad flashing f', is a lure to encourage clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=why+is+my+heating+pad+flashing+f PDF link annotation
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/nc5o0m15e0vedaaqfpo1ug6hu5/bedakatelavedopuzot.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/27f522e3a520963166c7b048744b1a4e/85166658484.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/nefaparuwit.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/vibosulabatixudazozo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a714b8aec87---fifabudijezudoxijorigag.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/tuvutuvufenimolisenol.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/7oibr96sqsadrnjqhov4v8g93d/25006795018.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/b38f19d1967af81c738e5bde36fd2d30/26033212029.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/78913539999.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9d9052f26af6bd398bd734b9e0dd891a/dubudumugatejak.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b0a1a9352---womajip.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/tovosojolifuzadov.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e45a09f657---xojuzanifula.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xalijebelixiruwesafo.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/ad7c0615bc5246de89d31796730443f9/86823137955.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b979d637226---57942500380.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E77 5476 bytes
SHA-256: 57bd4cdefc030dc9ff84dc2267db6582c00ac6753dcf7f9a40032e66c5042b9b
font_01_sfnt_off0001410c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410C 12084 bytes
SHA-256: 25fa6f871b437d411567c471e909f134053d2f8ec70c52daed170d6f4bd15ff0