Malicious PDF — malware analysis report

Static analysis result for SHA-256 373916721d6de0ca…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 08:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8349d46268d2cced96346f02a542bd1d SHA-1: 0a84b76cdfdaa0131dcf942c8585e271769bf3d2 SHA-256: 373916721d6de0ca1b7fbf8d4c2fb097aa61660369df49d01a2b24442daa93a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable domains, suggesting it is used for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9774

Heuristics 5

  • 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 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=algorithms+for+dummies+pdf+free+download PDF link annotation
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/55d1df8506375188ba5f67d1ce19b1fd/72098700755.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/e8e5b7dabb7e0c000340e7c7ea71b044/10583824864.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9e31506818fa24ba65bb7907da46ff90/nesavomumofilipepotexik.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112b7f404a4b---widipobelatedixuwebisi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce61ac7121---71599425942.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/56114020495.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f0fde0b66d6---62517508809.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/55953920562.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/57dfb68fa7dd6d523c06d009b51d8d46/11366292408.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/73760261011.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a092e4208d---nizadapopovomerevipila.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/gukubexakiresebejulofew.pdfIn PDF document text
    • http://runo34.ru/attachments/file/dasubaludazanuluw.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081713f0c9ad---zewawen.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/32573021047.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/20938842916.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/wuwamela.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/rekonopitamet.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/33375019568.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160753b31c0962---zifobumawosujobupibedopok.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/gatesalivefe.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/43305729795.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1E 11112 bytes
SHA-256: 11520aa51dfdbc4b0495db174638d0c66355bce5172f36ec5e28913fd6f3cc58

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