Malicious PDF — malware analysis report

Static analysis result for SHA-256 217051c4ab2b7517…

MALICIOUS

PDF

87.0 KB Created: 2021-09-02 15:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c67d9e97e1b8e1ba4f909b6e0ec6fd2f SHA-1: 269562f50c9c36d958b4f42c4d25b0aca92284bc SHA-256: 217051c4ab2b7517f87ce65ad3e8faacb4d18e253dbdc01f938824d7a961c3a8
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 CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://aptwash.com/userData/ebizro_board/file/59951758654.pdf In PDF document text
    • https://deltagroup.bg/uploads/file/gimonovelujemoforaninite.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bc21d013f---tipep.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b294af9a97e---xuvidatisuzizefalodenumok.pdfIn PDF document text
    • https://ikima.fr/uploads/file/43214254886.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/1f3e97fae62d4afb8bdf7344ad6a6c8e/85973574701.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/93474599909.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/46103922271.pdfIn PDF document text
    • http://rurisnet.org/images/file/36464608073.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d73eea79ae---kunopa.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8ea51618dce75943c7d84f8b60339dfc/femuvukumorikak.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/torasunimipolotilikuko.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ecfb6a7f6---24419243968.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/guzebeluzegamaxedoxu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c412a896c---42954726995.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/tibasajipu.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/94259485498.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/94077801932.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ec698cc09532ef631ca08aad7e22aa18/bilamikuboxafar.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/ruwijafozunezes.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/mifawisamovonojedolokila.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/merufuvurolofevaxi.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/82227493482.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092038ade651---3131136407.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/ratusorugiba.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/8446439492.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b42731877a---8762989336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=el+poder+sobrenatural+de+dios+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_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 17880 bytes
SHA-256: dc4f18c9c0f2045a6a29b2aa5c4672982676f4757d954c0aa629db0169837088
font_01_sfnt_off00011dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E0 10712 bytes
SHA-256: f9d8362d1d651ce6eb15a9c2361f2de7f5b4ba363fec005c3f3ac62a1a02e84a