Malicious PDF — malware analysis report

Static analysis result for SHA-256 822b84e3efbe23f5…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 06:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49e42ad870e7d28d4753c1f0fac8b1eb SHA-1: edc9d4e3ac6b3aca840fc51c06366c9b32c34de2 SHA-256: 822b84e3efbe23f59647b2ea72d8edab6cf27befbdfe76d8f97d6b3a9388399e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to what appear to be compromised CMS uploads or disposable hosting, indicative of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://smidgel.ru/uplcv?utm_term=artcam+jewelsmith+2011+tutorial+pdf PDF link annotation
    • http://cobbpaynefamilyreunion.com/clients/862770/File/ziribodonewisimumiw.pdfIn PDF document text
    • https://plasy.com/uploads/file/sipolegumoguvosavox.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/gisuzu.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/ec32c163d1a5c7e203c4482a8c5d248f/12131227794.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/fexexabefolebaluvorunaxe.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/lerajuxusozudunupez.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e5dc5a596---tidowunejozo.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/7af069d542e916c8c95fd623e6d014b3/zefopomovasopojosif.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/97228071304.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/20b1aa253fb3666973d7d93b96fd9fe5/51282796837.pdfIn PDF document text
    • http://jucal.es/images/file/mosowefos.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/50061634130.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1e7112690---tamokofifixalazulesokamew.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed524a586c7---danunajivuwadabubix.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/5800449372.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929389aa94c---kufav.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086caaf08d8c---seporedubinavebifupewu.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/mutimipa.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/mipavirizisatorogatip.pdfIn PDF document text
    • http://108homed.com/userfiles/files/samumerupumivopenelojepix.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/subokaludarofujodobebusa.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/bukibesejupegoritubeb.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2455624c---wugifiwegesesipoduwadud.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161093f878e33b---xibunoxodo.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/fde43550db465fd45dfbf24228a81b5c/83907240726.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/jidalebesuvuxuxe.pdfIn PDF document text
    • http://scsychem.com/upload/files/mizosoji.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160f232e6b6359---34283380931.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_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 11372 bytes
SHA-256: 4bb21792f9511a022c0124429faddc78f8a7bfd864b2473b3ee312d3e8ef3592
font_01_sfnt_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 18700 bytes
SHA-256: a8fee96e2787e0a1c5eb2275a1cc35ee5bca0ee77604cef3e682ba7749f001c9

Open this report in the interactive analyzer, or submit your own file for analysis.