Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aff7b60408d883a…

MALICIOUS

PDF

62.5 KB Created: 2021-09-21 17:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b0641c86764d6e3509dcaa9821b1cdda SHA-1: 2bec4ad12c3ee82654d286ffaf135508fe5e3164 SHA-256: 1aff7b60408d883a8312606a749d26c86bacf15af5eb659f162a2688b913846f
154 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. The heuristics indicate the file functions as a link farm, pointing to numerous external URLs, some hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9451

Heuristics 5

  • 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
  • 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://lordoptika.hu/files/files/40480693866.pdf In PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e81babb69---55895116425.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/82990668458.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c90502a597b8b27baa2a6746417d3d05/nosudaxurisaluvaworibanez.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/tumapiwajiwonikirasotikig.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161492df15d595---xipoxezajodadusix.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/15670874749.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/82157089745.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/gigufafupepolunagupu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4uidb38n5v6t24tqsr91ubp15k/vujiginunebinamewonumolu.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4cc02fb6fbbc68dacef9f7a1acd261b9/rizaw.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/janasiralepele.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137123315a3e---37545284528.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/7311359668.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133718f49412---wubibukewasavetitotitok.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/dofowonotoxagonov.pdfIn PDF document text
    • http://rococosofa.com/files/files/duwafiwutafatulo.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/fusipibomugigunidelu.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/10939406242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=send+file+messenger+mobilePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 10652 bytes
SHA-256: 0ee1b11d606897f50d329f11b8e96a92860e168f8f451c967f060a408c2a9f14

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