Malicious PDF — malware analysis report

Static analysis result for SHA-256 e260aac0f015874f…

MALICIOUS

PDF

98.6 KB Created: 2021-08-14 07:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee960c7507f1ff737912f52fc29da41d SHA-1: dfb8d890fa6449b8ef247f7529483052d09d4a3c SHA-256: e260aac0f015874fdef1f6153d9c1472ce7860797b35962b41cdbcbeefd11549
96 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 WordPress upload directories, indicating a potential distribution point for malicious content or a link farm for SEO manipulation. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://alternativecarrepair.com/userfiles/file/kugadunijazeredugogexali.pdf In PDF document text
    • http://helloslow.com/data/userfiles/files/wesazexenukofuferesejalat.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/46043745341.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/wudisarikoxozabep.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-16/20210616003856170697.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1cf316447---9492079963.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/62000167498.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2884e148f52835f374185c77b37c8975/jimadorizuvaniniroxu.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfafed99988---savoz.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/28941863207.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/nuek2ikj1lq6bp67j3p5l4u266/88749523626.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/rewupig.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/50984860549.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/50530761216.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084cbf5edfae---jomubatiparalulazizo.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/33148087188.pdfIn PDF document text
    • https://tantecoccole016.it/file/kuwutizaguxu.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/gibarukidizowuze.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210730_848CFE8418A70E46.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/82636110386.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11917358ee---sidoxekinufi.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3049df22f2b072a89b1efc7ee67802a0/mutesojo.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/62628854744.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/webivomogupijum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+free+diamond+players+in+mlb+9+inningsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 17704 bytes
SHA-256: 0fe6bb76900ee32ef9684c7a7f1ec484b7344332b814d80f7b45c5fefcddc8b5
font_01_sfnt_off00012587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12587 11340 bytes
SHA-256: 176965450038a9a507a3803f31df7574ccd81cf13c63eddd57d9cbc4bd9bf3e3
font_02_sfnt_off00013fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCA 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_03_sfnt_off0001553a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553A 3464 bytes
SHA-256: ab430045ba5a94791c45c8c87ebaca6374d039af1ea5371a2a4deb0d3ff8d9be
font_04_sfnt_off000162b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1