Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0c3877dc7cce08…

MALICIOUS

PDF

74.0 KB Created: 2021-09-05 17:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 58bd0b160be5cc97707cefda849a8726 SHA-1: 359e76bfd01abae45848927dc3c74112d003eb9d SHA-256: ce0c3877dc7cce08bf45ea2de683d0dd2f069f2a8bc1a022efcf224700fff9c8
126 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, and the document body was unreadable, limiting deeper analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.1969

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://rachelrom.com/rescontent/file/41030767937.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161315a5f53081---92945145579.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/49665898901.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/tumira.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/bd4494deb21c2e2ace3e27ab202f6b0f/jagemumavokum.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6706828e33fb71734944f5dae4a9ba89/43663613213.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/10356849852.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/qr7lphocs6d373qe67lseq1k03/70288330576.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944ee15c84c---bepogatebopebomupagemalix.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/63189178407.pdfIn PDF document text
    • http://secoinblock.com/upload/files/18168187642.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/30dda2727600ea0d97ab397232daa9b2/76638351873.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe1eb1fab5---lubamoziguvigosewufurew.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077405099010---87346109253.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb771523c6a---60200801685.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/65214062740.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210905040537831754.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0b627d1220b36a182373ec502ea61e87/gujoreb.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/58965034325.pdfIn PDF document text
    • https://taperagi.com/contents//files/vuwaximu.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/0cbc3f18cd2ece436d77c6fe712f18fa/78798435655.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/tozitodatex.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/nj66t5glvun1n3k8qk09bk0j6n/38327941774.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/36ba8ed9f15981f6ff90bdd9dfb23453/kuzuvolivof.pdfIn PDF document text
    • https://activepymes.com/pub/file/zogifotezowizipimuxa.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/tifuvakujefisewaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=biblia+de+jerusalen+pdf+con+indicePDF link annotation
    • 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_off0000c4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FE 18180 bytes
SHA-256: 1de148b550c6265a233a4499cfec2056901832d300b4927cc0a0ad01709630ab
font_01_sfnt_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2D 10940 bytes
SHA-256: 8b91db3a3c10e19686b77f93c6cd07346d7716e3fb05faa786835cd74babefeb

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