Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c981bc4a5c55d44…

MALICIOUS

PDF

79.0 KB Created: 2021-07-30 14:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e799a619613b2b5d17bd0a7986e0a996 SHA-1: 0ef05570997812d8ef4862f04dc4ce5fa949506d SHA-256: 5c981bc4a5c55d44c66e61e744f5b063bd958804bafb5b28be8ebb259a2abb6a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the nature of the links and the 'compromised CMS upload link farm' heuristic point towards a coordinated effort to host and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ketchas.ru/uplcv?utm_term=ac+market+4.0+4+apk+4.1+4 PDF link annotation
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5c89babd---72771485093.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/sawufesurefab.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/46503819419.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/21744276782.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160767f6c457f6---pezukukabopopizufi.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/5ohidci4bo0oqus7utdqhv8ah1/78949222500.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/wubatunopefamuko.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/lb8fv0h9b5mk8kj3v31ptn7v7h/1823963504.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/5f6c411cf04cf9a0eaa0d232ae42c833/vejuvonuvomeditubusubanix.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4cc053c88d97c3a0ef51b58f673f7775/95744914022.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3e82b15353350eb578efc86c0df792e8/fapovefokivitupatutidixo.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/jofus.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/mst4hh4o99me0lulscfnlcs5gq/51083852200.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/jaxedakewajuvolepijenen.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c0eed3ac6f7863e8158e8dc525eb49ac/zukusuwezogupe.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/87080817845.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/8532885097.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/44592412287.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/1cff2ac513bd23e38cd0ae9937bd8c2e/64857389801.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/wededasimonodiwejar.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/26839028013.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_off0000d1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 17408 bytes
SHA-256: 34b5e3f2af7a98283f80345b4701211fe8ca47744b04c00ee6bfaa5de26fb9ac
font_02_sfnt_off000116ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EA 10396 bytes
SHA-256: c7076cf197e3e21a740837eb911096556270530ee801efe9d6e92b74c6d296b7

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