Malicious PDF — malware analysis report

Static analysis result for SHA-256 412e0fe46d6e1591…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 18:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 605e06a644ca20547cefc06c7fc69527 SHA-1: 645a2833e4ff1fcdb27106aa6849dae325719ac9 SHA-256: 412e0fe46d6e15919d754a13a8dfd9fd38e144e2379f84c38905fc4c0416b5e8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to manipulate search engine rankings. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cedule-plachty.cz/files/file/99868386007.pdf In PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/jolofisimilopataxuwera.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6700a7a90b21c9464595c02f6643652b/boseg.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/pezurevodevobinukoxolod.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/14163282452.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021619950161630.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/danusimaler.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/mibajoviwipif.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3a789921e---liwufemixanev.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607da671e7553---wikosezi.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202108211823039855.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/h1cgno43afn8t5cbughvgmtqud/10032358124.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/15996210798.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/kunokilamiwumuvipinatel.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/14595467756.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/43015479332.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160937b5f8c49d---55385350427.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210805123814-josafuz.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7309b1c5faf47ba62be44d6085efa0f5/gubef.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085932927032---patipixok.pdfIn PDF document text
    • http://pasted-radio.de/web/files/bapujak.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/2e5c01588f96466b0d0189d60e33c73b/jozusinotinuxax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=symmetrical+and+unsymmetrical+faults+pdfPDF 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_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 18268 bytes
SHA-256: 4da3df807c7f65829256089a0da9848c44c8e3a3e719206e972dd0f0445734ca
font_02_sfnt_off00012ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD3 10952 bytes
SHA-256: 654d7bb270a77c138cc506d1091b9d3c506cc2ca394d0c76341a43a0abcfa813