Malicious PDF — malware analysis report

Static analysis result for SHA-256 a131dc6c50f465a5…

MALICIOUS

PDF

85.7 KB Created: 2021-07-31 21:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d78db4cb2a18ac651658f2c39f91c6c1 SHA-1: 306270f34aab741fb17f6de4c795c9904b0d11fc SHA-256: a131dc6c50f465a5a2c115ec3a208b54382c7ece7aaa47406b3790f12c13931e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted from this sample.

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 https://queure.ru/uplcv?utm_term=cycle+de+vie+des+animaux+ce2+%C3%A9valuation PDF link annotation
    • https://vinniescustoms.com/userfiles/files/80023813266.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/198ufi02u2lf85krsn7qql2vs6/kuwofugemadebazivaz.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/15138152500.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/5240ccaf6c3595f2e2ee9e8007a9897a/mibelumiserudi.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/pd1jhs67lkcups1346u9i5l2ca/getasukejewinet.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/gedizoxobe.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/34489195997.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/fosogutujozo.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/6b18f64a9e6e82afbdf850d69da2ff32/kabovam.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/8109558572.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/e9e9mln9ogrpdsp7ckjcmlhmvf/redubevawolasapibuninali.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3927bc435d---20707896724.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/25106021492.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/kizugen.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/vo0mchnf14mtpvllom0pj0u457/jowoxu.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/tetekowixupa.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/6705ce5a3a06ddd886bbff9e678c67f1/94616387295.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/jafemujafaxoworiridulil.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/6efdb2c6ee6f3d01a102ee915f5f86e6/88033251130.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/zokegosawaxuxep.pdfIn PDF document text
    • http://usagimatur.com/files/others/69947206296.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/zefufo.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/2349586470.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160965f488e5d7---77475661373.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091668ef2151---bejazefalipimuduxazox.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_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 17840 bytes
SHA-256: 48dbbdc2f24a022acaf188f10405a45fa165435acbc797a997fc0e934de774df
font_01_sfnt_off0001148b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA2 11120 bytes
SHA-256: 9903b6c898b571edc7172f2826aff076c71bb0537e0b14f2ecdac37331d46ac2

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