Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab038978b40c6b9d…

MALICIOUS

PDF

78.9 KB Created: 2021-07-25 14:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 7e64f57b592e4c2d2c765f139d2da914 SHA-1: eb243ef795edb8a2090c6766cdb99a93d7b36032 SHA-256: ab038978b40c6b9df327c29731d5a3da09732678666d3866a125e34de5a741fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a71fa2e8e---6751104755.pdf In PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/285500af8eb8ef1441f297672c5cee78/gewazufogomotu.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/57621818f9973c9a83c858c26521537f/faserabewe.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/84be85f28ed415743122f2ef54ff7a4f/womikogunesotedarunupad.pdfIn PDF document text
    • http://camwater.org/media/files/37874171119.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/33738285724.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/wixitenibe.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/dupoguweto.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f8f7119939a3703b82339c0ca78a5cc0/noxuvu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3be5d5dc---92281333443.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/jewativo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaecd3158c---97428678219.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/1ec7c265a9bef1e4f8be49e737edb93e/15866047003.pdfIn PDF document text
    • https://estoniapools.com/contents//files/41163325462.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/83920987226.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a39ter6vh245f9odccpcob68i3/521158456.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e6sftalbuqd5oh0c3lv0gbtd53/guzadoviperutegapizuk.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac47a53479---44214482298.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105061536355967.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d3df72bddbe772121891b3f5e79a9ceb/44225044702.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb063b8e6d---forulopikigaju.pdfIn PDF document text
    • http://yongqingtech.com/d/files/wetovutul.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/74142273303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=la+ley+y+el+orden+uve+espa%C3%B1ol+latino+temporada+19PDF 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_off0000cb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB89 11216 bytes
SHA-256: 824975936db9cdf0824b29fb4497b57c042bf00fd5b1437693f31a894ccad29e
font_01_sfnt_off0000e59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59E 17760 bytes
SHA-256: e8cab701beba0d751bfde424f4e2f83a89b4d822ebcc66e8dd226ac1203eeda3
font_02_sfnt_off000112dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1