Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf552fea65ed9f89…

MALICIOUS

PDF

88.4 KB Created: 2021-08-02 02:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 967f1f03a3e33eb42b02f8325bc1a7fc SHA-1: 01763e71e8657b868e0fee81b31201e8af74047f SHA-256: bf552fea65ed9f899ac04bf4b4f27760592423ada4aec225a04d97c3c7eee896
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, but the structure and URL targets suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f664c1c0d0---jazigibo.pdf In PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b03a986225ad14a6072c967b55144fd3/naxusekule.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081b41239bcf---zixoboreribaxegub.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/dt596of7qqha91iaa0c0nj6r47/80579172220.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff563d6116---walibinetufefuf.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/28493493983.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e67e2410f8---tuviwamodogi.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/totakalazo.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/vefiwitekifoj.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099d0392e5f4---39968233551.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abee3e37801---fezuwimiwiterod.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/19834980804.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/ralafinovobupowovoziriboj.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/33494390536.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/26e74f1c112c5e7ca997571e9869a911/wevapore.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/11951325024.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/kuleliline.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/a29e7kcdkq88s9r8mqb0jjrt51/gojebogakoxijelusexilek.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdfae9869e---13417891321.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cbe3eb49d---kinobogefikudobal.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/05ebf000b84217909e350ccbcac5d7d2/firatedix.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501072934270218.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/bodibekavonesazukog.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/4763605899.pdfIn PDF document text
    • http://chieucoingason.vn/files/53630160819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+is+born+haber+cycle+in+chemistryPDF 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_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 17048 bytes
SHA-256: 62ab759d5977bfaf52dc3085bf3e65db50860f1a1e85c28f3ffd3e0e18606ea0
font_01_sfnt_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 10740 bytes
SHA-256: 711f15106d8aed2bed6316ce3bb5b2389de0e85138f0d8abb39a2072d010f83a
font_02_sfnt_off00013ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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