Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad50690d8bef126d…

MALICIOUS

PDF

70.7 KB Created: 2021-09-21 16:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a745e13143e5affaccced03e2627427 SHA-1: 6e0d9004048c343ad5334193010aa24849734952 SHA-256: ad50690d8bef126d9ecbf64ae461d6c1d760395892d456205d378117012b9211
124 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites. The presence of external URIs and links to compromised CMS upload storage suggests an attempt to redirect users to malicious content or phishing pages. The primary attack pattern involves leveraging these links to deliver further malicious payloads or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4270

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://pistant.ru/uplcv?utm_term=download+apk+piano+tiles+mod PDF link annotation
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/584240a6f89170ce647c8aa3ee37e2b6/39671071744.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/19219019898.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/kilikitugorazijisatefubi.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/31776890676.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/67820399091.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/24944646851.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/fozegisukiselew.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/262c052b74801b4de1188215a87cdf9e/tetaraninaf.pdfIn PDF document text
    • http://prosquash.by/data/tofidigisigavik.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/57009393311.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/2294754592.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/lujemupogarizubewu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d386de702---gokojetu.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/49641790198.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/jozer.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///14485926688.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/67545597289.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/47099179821.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/79322937152.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce5665d8c---wikasivonipomedumewixoji.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/1287159932.pdfIn PDF document text
    • http://datcat.vn/2018/file/rowenasovizubedu.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/votevodaluwefupib.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/tejupavebuzitikomulutewos.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/62211522298.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_off0000e1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 10632 bytes
SHA-256: 3d42c7c80ea31b66c5fdc1927daf32aad16a438f0212cf1d368a32b6227d156f

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