Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac4fb8457319915…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 03:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75a6b2e154d209122d7999e917f5e121 SHA-1: de594152e7072d616ec31e6b8856cc503b2682c5 SHA-256: fac4fb84573199152db4bbe09fb6143e3855cafeb50a006b69bf717a1504b31e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan-d2568dad23a94d95' and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm hosted on disposable or compromised domains, suggesting a phishing or malware distribution attempt. The document body is unreadable, but the presence of numerous URLs points to an attempt to redirect the user to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://esoftland.com/userfiles/file/91715228027.pdf In PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/zomatezuzirevupodezeja.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210904121631.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/foterut.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/temilogipuf.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/39298383802.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/bidotujapedezeba.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/gesajugifedamamoju.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/9655709740.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/wumowap.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/gelelujidez.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/tidazusofikosolizudu.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/90372502370.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/nunegoputebonedofuwide.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613cefac1cbf4---16872965338.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/33920160080.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/74042012685.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/mipiwemisikogiwi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/43fef3fcd72e626cb8ad7a89a3aebfa1/gulubibaxevexapotoxeba.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/33245222705.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613615dbe0b62---62698319427.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/vilexazebufeped.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/sidexosupitogetomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=a+an+article+worksheetPDF link annotation
    • https://lapdonline.org/file/xikojorupeseletosabun.pdfIn PDF document text
    • 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_off0000d8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C0 17756 bytes
SHA-256: 94c64a96afd0aee1676811120cfbddbec9e91a0d06e014bfbab36b6ec3716c23
font_01_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 10488 bytes
SHA-256: 7837ce66676219fca14fc5758d9683c17facc4028ec436a20b90306bda507862
font_02_sfnt_off00011eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1