Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c25b13979e00677…

MALICIOUS

PDF

81.5 KB Created: 2021-08-20 21:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d451c93ddc91c7b20fa0c8d57854676 SHA-1: d544ebd21ba6e533471c8566c440f409ee8477f0 SHA-256: 3c25b13979e006775bb8d401e72cfe3436639c8b830320214f0df5baf278ad90
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress installations, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b202443e8e---82994689375.pdf In PDF document text
    • http://universe-micro.com/upload/files/20210730_013738.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/fd1bbca0dcdefe4100e1e8fec475a54f/lujexunixok.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160f27ff609c89---19016217353.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a48125cdc---40778065061.pdfIn PDF document text
    • https://2acontractor.it/images/file/66243460025.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/dubukebidewor.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/33137695795.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/0bdacb9bb75fe1cdbcfe2f0d554e0633/32778246988.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/dasodakiwedanal.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16103553c29012---13623734593.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/67161150049.pdfIn PDF document text
    • https://linker.tw/files/96707911623.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/mamedag.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/lnikd9iqodlt4ssk6n0uum5n5s/91948742694.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074accb8f5e8---fasibimobiberowin.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61e9d97e75---nutuxuzufapujibonurulam.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/9775537819.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608457258c832---29658043607.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/89835366304.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/76511915192.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f4bd291993671f92e9c0fc20fdb0fc5b/sasebamixuxavatoz.pdfIn PDF document text
    • http://dentistturkey.com/image/files/88741942710.pdfIn PDF document text
    • https://codecs.ro/images/file/wuvofasenixiwajeroxikogif.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/03b79e92666bbe411a5f1dd40b3fdd50/52174002064.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/90676061318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+the+best+do+it+yourself+security+systemPDF 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_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 16660 bytes
SHA-256: 39f9eaf8e47258f547b58ce037272dc41ed7705260f6b4187951e80a9a1b80e2
font_01_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 10984 bytes
SHA-256: 1066b58938e016f6e972203b72a5d1d06bfc1c6336655e0a6b6931e7e893ec2e

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