Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cd27df76b64804…

MALICIOUS

PDF

92.0 KB Created: 2021-08-03 06:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8c211225902bbf86ecee5d8f4660d8db SHA-1: 583d32f59cd741e7820ada18c271183c973f42b1 SHA-256: 66cd27df76b64804ec5f1caaaf7d32b5686753338fcff4f25972ba7bc58fda0b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and the ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://mdsalon.ru/img/lib/file/bofito.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b696e1a429---wunim.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/tepozebalefulofo.pdfIn PDF document text
    • https://armenia4d.com/contents//files/22498624379.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/5r6die2m6m7vsvo02ea5mqa1a7/zevalu.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/85931819842.pdfIn PDF document text
    • http://allasclub.com/campannas/file/xijexadiko.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5770ca5f3---kuropexazivisusu.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/fokozasukok.pdfIn PDF document text
    • https://akemi.ro/hirek/file/bagogawobifomorojen.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c5db5a8a8---giwinixugexag.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/92fbd762d76be789268d5161a31e3e1a/weluwolazitexisug.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9b5588eee---kogonotekiwoz.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160945ad5cb725---19722719253.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/df4bf46fb84b989426be9f7cac600c70/34688984195.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/48519898335.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/51543736737.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/utb7v6892jjhteegfm2m95bjd4/sabuwiremotu.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/45894800974.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cb0442741---zilakoguliwev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+much+does+a+container+home+cost+in+south+africaPDF 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_off0001008f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 17684 bytes
SHA-256: e1dac68fa6213ed4182f3be871bdebbc77444ae1ea93790c2c4a3b5e1e7f75db
font_01_sfnt_off00012f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F68 10872 bytes
SHA-256: e12b5d173e1dd8618bc6eed62c73f61f41c13cd2a404fd4319b0100a6940bc3c
font_02_sfnt_off00014866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1