Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe98153f83f3a07e…

MALICIOUS

PDF

97.6 KB Created: 2021-09-01 12:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 79c8ca1fae9d8b1e818da42aa29ca448 SHA-1: 558dbd1652468e5ce66d3500de1f3a209241a8d9 SHA-256: fe98153f83f3a07efc169232b6f32982df3fdaf1a4c00e04c127c9d412015bf8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kaptenhoki.com/contents//files/lunifepose.pdf In PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5987686026.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161033445b9c36---77644384075.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/jiwaxaragazibipilosorapi.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/rezowivedid.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/58216f4b8b45d415e43be50481e5c230/fosobozoxuziv.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/eu2rffgonghe15bkj7qnbpgj5i/fuwogosedezeden.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/mupesibefu.pdfIn PDF document text
    • http://dzbnf.com/upload/file///xurimutogikafamar.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/oj0988sho66tssf2646215kcvq/pejikaxodinewome.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085456ac6f3c---26827562211.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/2210177909.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/gowanisuzemobuzupoluxon.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d82c218c0c9---romitegewunije.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/57229993605.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/1744964543.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kuona9v54vj4o3sb13jn1dhtt4/73849362359.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ec607e1c5f1eb4f64a18b645df87584e/luduk.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/fab26a601f5154548ca65f707cddc161/kilawenidexajolukorotef.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b120dab168116ae23798c0bf6fce70ba/16006045442.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/37059470921.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2i2srue78ppvqke5l6le18uqid/jawem.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608119e81b337---35120590965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dj+afro+jack+the+giant+slayer+full+movie+downloadPDF 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_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 23344 bytes
SHA-256: 36cf9504d6a51704839a7f74c040b5ce9101b4207640fe7bc62f64c75a4854a9
font_01_sfnt_off00014410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C27 11512 bytes
SHA-256: deed755ed1afb6fdeaada8f445142742a376a4e84ad9cd5b473db8be676ec744