Malicious PDF — malware analysis report

Static analysis result for SHA-256 dada97894e7afce9…

MALICIOUS

PDF

85.9 KB Created: 2021-07-31 01:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a4155002afce8d5156e0b63f503e6ba SHA-1: 87b1cca1abbbe5715d7bb6805d03043c5c08adfd SHA-256: dada97894e7afce943eb3c8407577f1e924b9aae6202abb08ff67ed9f16c8af5
154 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm indicators suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7825

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://noddy.nu/images/file/dorobazu.pdf In PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/tegawejoti.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/senojopakigewewiku.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/fgpngotbhkiqk4l3mb6knr5k5t/sopuwojozax.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5443f2016e---ribud.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/didedawuvorog.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8992d77b---bebigadakuloviviwetisuli.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7b3811896483c4e0b3a017c4503d2977/gikujen.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2c02028b---tetiwixikasatekoko.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/qraj6v6mlqug9am6dphjfp36qt/1480917813.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ecd55c15d---wujiwajaguxofewabiv.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/abeab3dc9ff9e2595122b72b9ae81d61/xewexegitokital.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/wuxexurikov.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088a50a6fb1a---91765039962.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/19839797182.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/16c8d0e806e0108ef40e604829067522/nudilireretulogesabamaj.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de2aa8dfff---35147800988.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/93477388754.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d3514a1f3ef---93102885014.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/uk6e5r4f37p831ltmej7r5r3p2/27846999611.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/geluxudifapev.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/sijokafanevapokireduka.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f29103d5c---11867837350.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d53f592f75---gexavolefadosowezevaw.pdfIn PDF document text
    • https://33mobility.net/uploads/files/93458582381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=complete+druid%27s+handbook+3.5+pdfPDF 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_off00010735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10735 16400 bytes
SHA-256: 7c62275a26f426c6f76a7b910393943721790b0439145637363966f026cd3f70
font_01_sfnt_off000131d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1