Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85256b2a0dc41b0…

MALICIOUS

PDF

72.1 KB Created: 2021-08-20 02:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c348566b855238c0883d465d367430c SHA-1: d048a76f98df4c301793548e56058d182d2da972 SHA-256: a85256b2a0dc41b06da042a3daae6cb05ff8c9f62742e1df1714952f43cf0c6d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's used for phishing or distributing further malware. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5471

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=celestial+church+of+christ+hymns+mp3 PDF link annotation
    • http://marinapogon.pl/upload/file/51590487017.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fdc634f89---gijad.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607675805575c---ralepaborilewekekeraros.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5e9016d1af59951fae9f90bee6acbc8/vosuto.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210627205041.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070b744bd71e---febubitetarutaxesebu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/8476b2b0760320abe00ed321952c1444/67892045871.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/3296605587.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/korinuxavaza.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070386b46d43---bapitefotobanulebaker.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/62911041459.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/20829369896.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/tuvepixukasud.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/6kfsqtpmn8uinlfese1gtanvu1/77896492130.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/21832ee7c79ee470cd46d1e6cc6a66e7/75677568931.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/tivesobawena.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/lizovedepunonozapanil.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/oq3bigjdjt4ohbtltmt85arsd4/61881997128.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/bofakatebufuso.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160cdde53e0108---84635442549.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee434742c90---tafunuwovemi.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13b75a0a69---keviwojikuguwodulabise.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/58117975269.pdfIn PDF document text
    • 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_off0000d710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD710 17452 bytes
SHA-256: 49827b998b95223a4007234eefeb614e1be0f5220523ef15287a08c14df96ae0
font_01_sfnt_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1