Malicious PDF — malware analysis report

Static analysis result for SHA-256 4021ac1e5e27161c…

MALICIOUS

PDF

112.9 KB Created: 2021-06-25 22:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 60d05d188d00abfe0d91bba550545ce0 SHA-1: 007c201de74d1604e74a41534a5d6c564729d513 SHA-256: 4021ac1e5e27161ccd5f562afee3c6fb512c36bc78fe56f2fbca49f67438054c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, but the heuristic firings confirm the presence of external URIs and link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://veterina-hrib.cz/user-uploads/files/morurumobivenirop.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c7128bc2c---89237336306.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/datodusamevalukemuto.pdfIn PDF document text
    • https://olterus.net/contents//files/fojuzuzerabowevisepi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607befc4818de---70137252150.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/cfce4c41186a43bd89b135b0e2d741a8/ramutuxevak.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d231b99451f---tilinoz.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/opl39vf61hla68lre10s3t1gk7/sotatusagiv.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/59283736935.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1dbbaaafad15a13eeee60862e749092a/vumotozowuk.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa117df439---wofaka.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/70dbcd10qmg1n9hbrtvlr9u4g3/4470155294.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/puzajitomefigimari.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e867e673d6---tekilivowu.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075062e141b8---zuxuvawazefebesiwowe.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810592de3d4---girazikoxuzimu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e0ff364fe---garerinasevobafexusixo.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8461c695d741d971d69972349b39996a/9486902884.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd207f758ff---zadasa.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b4bc7a034ad4d37553bef9ac55fcec65/jujokenevozitevuguno.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/78091367544.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/dumirumusigejaxujineka.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/86ef28c9407e6c343f419a87dfab6f7b/19745691048.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/dojaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=70+weeks+in+daysPDF 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_off000159fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159FB 17360 bytes
SHA-256: cac5f11087608a405b500d23d2dd37d4b08848c49d23a5d1885494d11293a7c0
font_01_sfnt_off00018736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F4D 10244 bytes
SHA-256: 9b27b624fa787a1c39a27e18eed78364871cb00166f6f3866cd2c76efad1c8e3

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