Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b9d3c0e7ddef55…

MALICIOUS

PDF

62.6 KB Created: 2021-09-05 07:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bb97a85dc08b2280cdfb05a8f9595d4c SHA-1: 34366d0e5e2c2130b89271e02e6e551f1fb738e3 SHA-256: 16b9d3c0e7ddef557c9ccfa00b4531f278c91750b86d6e22e683557dc37e0703
94 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous URLs pointing to various websites, some of which appear to be compromised WordPress uploads. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt at SEO manipulation or potentially distributing malicious content through these links. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5956

Heuristics 4

  • 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://cructi.ru/uplcv?utm_term=literal+equations+examples+worksheet PDF link annotation
    • http://muzycznescyzoryki.pl/userfiles/file/siwujamifejeja.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e22f6acde1c---xirukekafizivurezoz.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/taruxo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b023865b9e---52454078702.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/tusamunoloma.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee421813a31---31937450884.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/46108711007.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161073f83e552a---4231717155.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/vawasafudemiwosarevopa.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/dalevinotexifizupeke.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/97748873998.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/beroxexawewuxulularo.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/xetiranavagutuzamebab.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/64767027821.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/lotedif.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac20cbdcecd---27407015391.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a341a971f---22303498229.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f494fd816be---40999013453.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f4a6dd6b3---gikululaditotatulatume.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/daderovizopukatisupotosef.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd4b41a0e7---vebewikaripirez.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/tutotaladupegenowomomew.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/wedasalubosovorixuzalekug.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000debd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 11000 bytes
SHA-256: 702cf99181e4991a2c3de7614246bba85c95068a4f2f1d037bd6dd36f4bf8ed0

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