Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df5b4dbe592d8e8…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 07:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87fc062ff56415142d6ba9c97983386c SHA-1: 39174abbd2659d589cebca936d33b9d6b3ba0a20 SHA-256: 9df5b4dbe592d8e8234c0d1da22cc8d6073a7fa18c757b0397b8d009f4392dcd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This pattern suggests an attempt to lure users to download further malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://gs-hemeringen.de/ablage/userfiles/files/fegigujenunubitidusen.pdf In PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/68005966894.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/16900552324.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/o9u1275f8n1fuomm2q6tm3sudm/rikogegelanepo.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/megite.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/3vjk442ad4c7prpqh1jjdvjttb/98722448101.pdfIn PDF document text
    • http://faulkfamilync.com/clients/c/cc/ccb94402b1eed20a0583117be0c0b506/File/42574479335.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/penalesexefomiwopuwewir.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/02e217bc891cffe86a5cb00966020cbd/69490184733.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/25518569919.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/zasuvavisujapomavisomifel.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e0658155f1---sasezekezeneniwarim.pdfIn PDF document text
    • https://iword.de/userfiles/file/26281275448.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/85231078771.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/xitasekawuworutunomujeg.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/vowerutaxikeludojasari.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/solafarajutosokopulibu.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/jupapejeva.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/leb9ecuqvgqn6tkohopjbijg1v/berilutufifejepo.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/87011885692.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///felidijefe.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/40352232254.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072f7bbc498b---86523120399.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610e406d02d48---gafifabowodam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=past+simple+test+for+kidsPDF 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_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 18024 bytes
SHA-256: b05d31e219c3bed05c1522312db356f079f3422c9fa73ffd354d7f7179756be5
font_01_sfnt_off000110d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EB 10648 bytes
SHA-256: 43137f591a154cfd55f68ac555c5712a7756c2c017c8d66417a659bdf99e5be3

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