Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd8920b98cbd766…

MALICIOUS

PDF

86.1 KB Created: 2021-07-18 22:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d3ff120aacbee157deaec7a8012cb16 SHA-1: f8bba83c45bba8f03e303d14e127c9bbe2a26d8b SHA-256: cdd8920b98cbd7667e104b18171ee67c4986ce2001359ad0f95e67c1edf9d870
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised or disposable domains. The primary purpose appears to be to lure users to these sites, potentially for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://karpatskiles.ru/store/file/zatirewuj.pdf In PDF document text
    • http://yasaitogo.com/uploads/files/28417095344.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6f9859a7999f589034845addc0fbc48e/narazedaxekemebolerixewu.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/65279200654.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/luturifokexatonoposisa.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/rimawisepuk.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160963641d3564---59422140058.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/032fbf77996e97bec716aa5eebcd63b0/dimosubegufun.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/sasebesapulaxaxelulikaw.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/valulujamuvodeziribifuk.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/tasidafijevefiwepe.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/witodojusole.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/gowuwelod.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/fca5c1b00b83c56c971b041982c6bc30/81508598208.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/51fb0ed966c84355f4fe25bf22bc1d9a/82977275662.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f77b58660c---73020609054.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c3c09c742bdc7ebb49357d05d46bf2bc/40380101194.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/lolawivazotibigupeg.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/avremj1d8t0qsaommnvvmn0njl/pepizexamijogix.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/4886ffee102ca298d3a76941c1dbef41.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/etqr5mvsl98vtggk55g7ik9gf0/18267871174.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ed7a44081---23808026798.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/10501740041.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/guloxinikejufaloviwis.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609025427dcae---wenurewewuxubutedival.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/59c363f985cb428f605e4da890b51eef/52513061979.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa94b1463f---kizasenagokukuramatoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=nuages+claude+debussyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 18120 bytes
SHA-256: 366742729adc7e05cab937be5c651f4b788935c7d4f6b8679b625f8d409444d3
font_01_sfnt_off00011a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13281 10360 bytes
SHA-256: 84c24f48c194e2ca72061d6ff80c0d7bc78e28e51ab1332ec79ba77309b8ee6c

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