Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89f6339c699cb77…

MALICIOUS

PDF

77.8 KB Created: 2021-09-09 10:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb394fff1f734b6ecd8eedeeda04db92 SHA-1: d4d80b26c831d25dfa952a67ebd38a9929fd3855 SHA-256: d89f6339c699cb772b5992115a705c2ef89034cfb2072725a9deb6267fc6a11a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with common techniques for luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://goldendoodlesofthesierranevadas.com/userfiles/file/nupotarex.pdf In PDF document text
    • https://carrieres-pierre.com/userfiles/file/dazujavewiwije.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/dojavidume.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/nisunibojo.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/37030905072.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134437853ffa---memofadaresilabajorav.pdfIn PDF document text
    • https://oferta.lt/i/File/5855671368.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161395426d6e72---velorawajunokobekepugiz.pdfIn PDF document text
    • http://grimastone.ru/files/97026486794.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/fepugodinafimiwulex.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/zijopepi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f34b030da---31910995961.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a3d1424651bd57b936fd7868738afcab/tejabojitere.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16132a5d13d396---jomakizisu.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/mozero.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/51351368155.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/mamilatisotutofofamuropu.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/wologaxovapejoxul.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/filor.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210901085727.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/99318865372.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/boloburobirirutifogimat.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/besatokaveselajipajoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gravity+defied+androidPDF 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_off0000c3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 10352 bytes
SHA-256: e8a7c1321e79edfc3d88581fa298bd52473fc0976f5023e305811065367cc43f
font_02_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 20564 bytes
SHA-256: de692b9bfde1da65a6f21a4e04a59b9bbf43279553a3fd464a91f78d1f09095a

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