Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d62d7f10c36824…

MALICIOUS

PDF

99.3 KB Created: 2021-07-21 22:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0f09cc063bb29feead8872a5342e3762 SHA-1: 95157881ac0f49a51e8f28babb4473051ac5d159 SHA-256: 73d62d7f10c368247e024fb631dc36125e9ec57959c501d54af5c0181042ba2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous links to PDF files on potentially compromised domains points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://mt-creativestudio.com/ckfinder/userfiles/files/mofuvivimikunipomu.pdf In PDF document text
    • http://unionzglobal.com/ckupload/files/sejibetesovosamab.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/22959741085.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/acc3b5ec4d5ae4dadf3785f516abb7ee/29792993380.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/jevomafofaj.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebc1cd731a---49084511881.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/16a1739057c09aacf289f98c5c738553/zosizejatipaserodaxo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/72621e72856859dd24df6067fc207e9e/31249618600.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f34c29763---tabozevedipapijepuwukuji.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/mejosetesasasapuko.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c283039e3c---firajiponajuxebevujadedub.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8c0f0a7ac---serudekemanomoli.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8cf4ed1535cd631d1ffa6123b526fdc9/78498469440.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d065024ffd59d408a3539df0465109de/guwadofi.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/0c317ca62dcd63773d3c2a42c2a72111/18130378869.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/29778079946.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/f7a2d7beb6e17ebee3164724336fac82/giwaku.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/farizos.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e559e97bd---mupapexuxazipives.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/654mntmhkah4ejpob1q360cbg3/dukegudig.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/zirosaw.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/de7cbf2bcef8cbf39a711d5db5ce6aa0/kekepipexap.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/nopanowobabujovibovuk.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/bukukegaxurelutiwezup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=assassin%27s+creed+2+discovery+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012fff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12FFF 29228 bytes
SHA-256: e60571c6d5c1c10bac3f21742aeef3dd6b795f48b61e89940242fef4dd8190e9
font_00_sfnt_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 19772 bytes
SHA-256: 720f2f657f9a85bbe00266c626dafc1cd060c35e6986f25dda38321bf0ae50f7
font_03_sfnt_off000164d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164D4 10772 bytes
SHA-256: e1460ceca84b1c15f9b0526646ca6bd9cb30cc61d0cc4f31f1a4e52f45831d4c