Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4868bd8b64f467…

MALICIOUS

PDF

77.7 KB Created: 2021-09-03 10:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bb780551851a2f3e54febc19c1373985 SHA-1: dc4affd531c157c4d7a32a3016d79a355e2e0a74 SHA-256: 0b4868bd8b64f467360490a56d588294230eef915e5659ae96470aa78d70a01e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/74bc550389fb40fbdc576c11699c54de/78356825595.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7f11c49e---94831360790.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/72404088192.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/valususinomopunime.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/95302407400.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/59e8ecf91be920bf8ba93d11a78b8156/nimub.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/23326883549.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b09e4a1d7---30829623618.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/57560906530.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/nabonafolivifuwasolo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf5e753935---85211550265.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/79100217032.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/bolire.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/30344504528.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16080f9afb753c---45663715500.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aee81aad2c---8282331753.pdfIn PDF document text
    • http://emachn.com//data/attachment/file/jafavaxe.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae841b0125---66534802288.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1aa195064---19634638366.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/62226408978.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdaa4eacc5c---48227536085.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1iado8gndtvammn9m4o7pv6qv2/kefovonaxaxeseduzubadus.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/187bd3e53703492c24c849d304b41608/11821228847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=kazuma+jaguar+500+repair+manualPDF 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_off0000c95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95B 17512 bytes
SHA-256: 0e78a323eb11a6d0e2edda6b3fa7e0409b0695ffc9998103beb2979468749c18
font_01_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 10744 bytes
SHA-256: 3b816ae1e839b00f81742d0707f94ae69e873fb9ba33228ab7e1fb6bb2e140b7
font_02_sfnt_off00010f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1