Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d61cd0cbba0ecb1…

MALICIOUS

PDF

90.2 KB Created: 2021-07-17 16:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: afdbc61e8dc3c2f86724b5ef4328ded2 SHA-1: 2f8683387e9044883ad50bc7951a8e3a2cf6fa3c SHA-256: 5d61cd0cbba0ecb1ef396f23be9c86f367bb51303d7fe04b35d6fba843d74fa5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload storage and other disposable hosting sites, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs point towards a malicious document designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cortabellanews.com/userimages/65486552600.pdf In PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160af5fcba169a---zonukipukeluzem.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/wilavakozava.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/jexisunutopat.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/kiwasatokogoneforevemipij.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/99386516973.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/68449251471.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/gasafi.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b2ebe3cab---75994736310.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082920b3427a---8279395908.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/jopikudus.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/41546864837.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608379b43a926---90028880408.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/39671747060.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091423b74359---mimiluxiresoju.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/v90osboosho6vhfifrn5sfm897/84710107836.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/roxelizasiba.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/dujopowo.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/68ccc7f9eb779ba2a4498080db818355/negeribijijafe.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/73893646166.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/42808209373.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092184b137dd---3703928508.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/39816910316.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/bokixedakosu.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/jivajug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+does+a+witch+drop+in+minecraftPDF 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_off0000fc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11477 17352 bytes
SHA-256: a09a3665d0d31eeada1f9decd1470afb01ba7e42327180604cbfc7f00c4eb15c
font_02_sfnt_off0001422f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422F 10920 bytes
SHA-256: cc15f18073c909a8c39bd9253c1d9295fc57ce9bf01e7786f5748aa804a63eaa

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