Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5a5f2ad16dd15a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-07 19:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc3617ebe6d5cefb9c8bee773c5c9e37 SHA-1: cad01bdbd7de5d3f71b2d53600168b0985b0e641 SHA-256: 9f5a5f2ad16dd15a9ae80cdf99008dfbf4ca56b69363dc40737c614eee7f08b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV, indicating it likely contains a phishing or trojan payload. The document functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3271

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://smidgel.ru/uplcv?utm_term=circular+and+satellite+motion+speed+and+velocity+worksheet+answers PDF link annotation
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/niradolo.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/fcc55a7b03a30998f5169c053720145d/korafazilazolitamom.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/bixakozutolumuvufilepuxor.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b25b2f149---7249176648.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5367dd301d---jasupenimoxarapuja.pdfIn PDF document text
    • http://detector-billetes.com/Imagenes/file/57761498200.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/nemapo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709526a0b80---garinetifamuzetujo.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/tetegetibuxodasosimavu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/p06cnu7q7ecughpd82bj7110v4/kuxodebiduvova.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/gigomesusesikizodof.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a11bc084468---8604969455.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/jagiwuwibulafejamokodilev.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/takubixajemibave.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/bidinag.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7dc6baa77---tateperabel.pdfIn PDF document text
    • http://otczenacts.com/media/files/24443147746.pdfIn PDF document text
    • http://dsagco.com/Upload/file/kofudogenatogemox.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/81814386249.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/4031639027.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/zutuxidugeb.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/15667968276.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/dikufatajejajoni.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161043b1787dec---58287805568.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/73850265510.pdfIn 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_off0000b94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD160 16652 bytes
SHA-256: d6aa10c763fbcddcd3a142f2067545bbcc0486c56950f4fcb48a496409c31c64
font_02_sfnt_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 11268 bytes
SHA-256: 2097dbed9cb7124bc4057ffa6dca0426d23e1c95cbdc16a7ff0d4bf9893c96f7