Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93f5040f9877c6f…

MALICIOUS

PDF

97.5 KB Created: 2021-09-01 04:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8af2b5c1930b5284f624393da4f0f9b6 SHA-1: 21cb82d3aafc52298265be00ab3b040988e789cb SHA-256: b93f5040f9877c6f2fc10a00bd919b40de929b00e24fbb5086f2fa94c8649cad
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS uploads and disposable hosting. This structure suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/nozexewezuviruseg.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2026caaf7c---17215342819.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf95d92d06e---14912546884.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/k1v277o0r24kbqvtqs6eg6fqr5/jubonoxukijugameg.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/91582067438.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/cc3836f00457c01131f108ae2a02bb38/pozivimadodojudabelozi.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/50b488fcc52fa61269c91af23c56a8c0/60481708603.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/287852127.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/duvazogi.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/7afc0db69f0a876a8a7de86f18911489/zuxenokiwafipij.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/ludunebubiwarekewug.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e6455b5d5308cf33adce01777b7bde46/wijowepuriwigabowavuxesit.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23ef551e59---85852852217.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/62945613439.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d85f266656a8ff881901afdb2aaef904/liwuxazemaxupatutoxivuwom.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/kugavawuxamiguvixubikuz.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/4o4ltdkd019ugnq1bdk0cdhk5n/lofemurazuxutukaxizoj.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/fegeg.pdfIn PDF document text
    • http://3sdent.com/upload/files/sifamimemojetufo.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/tonunijamivemaz.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65f5be575d---25322815898.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/vinerewojari.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dceaefde808---70684515232.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/bae7a00f5651a48c69c2dc5343f91ae1/57869709978.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/punadopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+witcher+3+gwent+monster+deckPDF 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_off0001165a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165A 18924 bytes
SHA-256: 78c3b2be9db0fe165d1b06cb32986f052bc2533ada89ea8ed86f487a5400899f
font_01_sfnt_off00014673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E8A 10924 bytes
SHA-256: bc704b0e53f0d892577b66b6ae1f6373820b84879ee76c9f68a5f2ebf39c2a96