Malicious PDF — malware analysis report

Static analysis result for SHA-256 552e81d27bcfe533…

MALICIOUS

PDF

90.7 KB Created: 2021-08-04 08:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1210e0637124c54dfbbd30c8db5c2697 SHA-1: 0ee8b0cfd64ff3c48aecf2228fe6a8f5271ba363 SHA-256: 552e81d27bcfe533ed87188faf5cf9f415eabd1da3439bac1d47ca25c5f5ee41
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://prospr.fr/ckfinder/userfiles/files/fefetete.pdf In PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/843bb792144c9f2ed6992100a68a1ab0/xumafexolaxukoxusuxinexa.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/33131731690.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160767b24a575a---34781962388.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210703_EFC33B4C88460AB8.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/ravidevinukozutopuxogagaz.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/15930352680.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/32043243566.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/56439245146.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ac216631364---gosufuna.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/58357524470.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f3307226---kesolavopavip.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3573fffb---mesavutixusavodofig.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c8f5b2c1---83764132777.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f462d3858---58107169695.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/28336772327.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/66412686399.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/5e2e5098f2a522b3d2094732b6a810c3/70977560914.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae561613bb0---medalukagofofizi.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/03a2ddf232e8664e940b8fd3f7d867ee/29897959132.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d784170f8---14183491993.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/86dbcbbdf208b4e3ec72db816cce4f72/23211173844.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d375901a93---lupokaboxenidu.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/fojajibonagikizisafemibu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/0aa274a973ea89c0c49e48f0685dec0d/41983120102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=star+wars+the+phantom+menace+full+movie+online+free+youtubePDF 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_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 11328 bytes
SHA-256: fdfbab9a06eb3e30d04fb2a1567baf7bee56f01be49bf3e3594b9281cb3f40cc
font_02_sfnt_off00012b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B48 17528 bytes
SHA-256: a53f8091c32a4099c6f76a7a99f67d900aad78a291c2bed5766e53428950662d