Malicious PDF — malware analysis report

Static analysis result for SHA-256 e673dd2a19f5b181…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 06:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 144845a50b988b3572aa4271bdf77f13 SHA-1: 57467e9f1032163a280eef345059d9c576e4b7e8 SHA-256: e673dd2a19f5b181ac357d11d41f6fa3b360df161643125859bead76a3381f1d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains, suggesting a phishing or redirection scheme. The presence of these link farms and the overall structure points towards an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.psyforyou.nl/upload/fckeditor/file/53643851772.pdf In PDF document text
    • http://legalinet.eu/userfiles/files/24676150459.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/kutinobalaxagufof.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/tonitetifarasigovavezoji.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/zijagitesijakanev.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/jakutubuzilumojatapanu.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/puris.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/a5q2l10k131jj72cmk5mc9gk6d/vefetibaraliferorof.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/fizibowiwibupedaduju.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e7cd8161215527daab650251e2f25929/zarifuwexerimimodukosum.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/somisuzelaxu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e54fe106d0---14348098080.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/90c9d483c05b7c376aa9672f1d4e2d11/79570810569.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/efmb9gf0tdkurhnen84acq2i5r/59610375209.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/btc71co1op0vn96c5q9ch4apsi/21420461583.pdfIn PDF document text
    • https://limsurdua.com/contents//files/lenavase.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/807f357271a2d014453f61e1889e353d/duruzejivi.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/75464235959.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210604035003166.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/ligujugiperosajofasa.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/noreketapojidiwalojog.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021932055461003.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rafajutonikududezafudame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sharah+qaseeda+burda+shareef+pdfPDF 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_off0000d2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 19616 bytes
SHA-256: 313b02d4484e3490a8e63fdd0ac79bb5577baa40bf889a7c1f9a744be4369155
font_02_sfnt_off00011eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB9 10596 bytes
SHA-256: 999c7533d0b93c408b861e744caee2b43d23c4efb17080cf9569b6a036dadf15

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