Malicious PDF — malware analysis report

Static analysis result for SHA-256 1030d72ae5df37b5…

MALICIOUS

PDF

89.2 KB Created: 2021-07-16 04:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 36e06a098a6cf7f559ce2f7bd82bbb13 SHA-1: 39418fd308c3ae9942be153dd429b57f25ae8dc3 SHA-256: 1030d72ae5df37b59644f08816feb3567f58f258e46d9c2bc0204a649d031745
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.rosabrockenhaus.ch/ckfinder/userfiles/files/ravuwidufo.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3cd6368be663fbc324e801bc4479e5af/nerul.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb50ee5c621---70830416415.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/55242450458.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/24b3d7b573e7715cdccf6f43526fafb0/98363640345.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/kexavavekobipemukifo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bea8e625670---65032426719.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/8385e91a7766c5ef28ba391aa413b549/30877297918.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/535d6d68b346e07be6bd8a86f23475b6/menedukiginalewesiwofiv.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/27458279596.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2c1382ce3---lirizovawifawenav.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/sij23o5b67iofkn8d3k42ttsbf/26956281338.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/mugulejepowokiji.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5256a923---ditajudukukaliwemev.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/0mfrkkqis86ktkmub9ipsnhbq6/mebanaf.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/gimodiguzivewenovadepe.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/684f04f6da5863a01b7c8ae45fde3893/bulipumogeratadur.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f25f8b2c03---xexatetisigesuzuzenu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b77db906fb2---76208231291.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/wemivorafotosuza.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/rugovuvikugawil.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/e0noghj9bu9gqg5tspcgmhfan3/85623093101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=solar+photovoltaic+technology+and+systems+a+manual+for+techniciansPDF 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_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4F 16524 bytes
SHA-256: 5f60bb28bdad30e360281f1f67b7dc6359a64cab5efaa774988ce8d817860954
font_02_sfnt_off00013a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4A 11424 bytes
SHA-256: b3b8fb2d467cd450170cbc718a9e15b3e42c6fa585f93d0cdf5abecb0fde4f05

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