Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5673d92c8e9b17…

MALICIOUS

PDF

87.5 KB Created: 2021-09-03 14:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7146961b149329062707c232a6760caf SHA-1: 172224e9b8ca54627ec6078d54319cfed25911ab SHA-256: 7f5673d92c8e9b1796e5d0e74c517f03d5ae5b8d91bfd846cc903ee8cc0bce25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/12bc3f55793ac63782c2065f52eeeea6/89373084514.pdf In PDF document text
    • http://asea-admin.com/_userfiles/file/20210814092322.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/buserulenipidonudejibef.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/22339857023.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608100e1460a3---66211143509.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/32709486854.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d34f3dbf1a---xufilo.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af0d6a1706---53044753999.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/842ab40baf197be899dbfce3e16a06f9/66557749472.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/roxeg.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/24837795268.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d06e240ea56---verutisirijovapoliratuk.pdfIn PDF document text
    • http://raczcsalad.hu/files/11794644830.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b5c25704a---92340231357.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/71054564490.pdfIn PDF document text
    • http://mega.kz/media/upload/files/38129774024.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/diwubozejol.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/13149414235.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ddc01ab98c936b94bb628eaa4935e014/58975145767.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/dozibi.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e35f1f047bff6eb2a3e31ea6d0565a10/39936811789.pdfIn PDF document text
    • http://chpcentre.com/files/file/68295954721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mueller+fire+hydrant+reference+manualPDF 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_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 10660 bytes
SHA-256: 871cdc89675f9966e3ef6a26217202b5725368999c1c4c13fb870648f5382fea
font_02_sfnt_off000119c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C7 20152 bytes
SHA-256: 200b7394bc80df299f0c0368303ffa0078ec2fbdb55bc06086f69ff2abe10e41

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