Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c830eea61642f2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 13:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e7014d60f30f4fadf0ff3a6e0e1d69d SHA-1: 98889d12110910785e568acde994a9a6b03630e0 SHA-256: d9c830eea61642f20c13dc92eaa1ab2484559a925cb50488a87e61124224d27b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://coretry.ru/uplcv?utm_term=how+to+download+and+install+play+store PDF link annotation
    • http://uekekb.ru/!upload/files/71184502441.pdfIn PDF document text
    • http://samtekelektrik.com/files/porafutipuminirurisojuri.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/70086571096.pdfIn PDF document text
    • https://umutfm.com/resimler/files/52209142198.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/42705447994.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/jefavupugidemosi.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/90864487398.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/nafusokosejadipuxef.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/sabafafedafekobij.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/volid.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/64332950641.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/10259504146.pdfIn PDF document text
    • http://tecksco.com/upload/files/29086573924.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161328a6112880---legesitanafabetidazurozo.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210920220521.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161404d61d0d57---8561680798.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/32037230259.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/turivitojareb.pdfIn PDF document text
    • http://nscenter.cn/upload/files/bulukazazezirevi.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/60492151047.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/59054700390.pdfIn PDF document text
    • http://swhos.com/upload/files/81147600374.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/munuwororevetidowonuso.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/zufosidij.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd2d268a06---bapomavazinur.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/gejedowesoz.pdfIn PDF document text
    • 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_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 10576 bytes
SHA-256: 48135a766811d5069fb680fe7eee5f162922d68932b8b03cda63a58e40aa0134
font_01_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 17048 bytes
SHA-256: fd248960f9d7cd516bba02f87899f8259c23d45e9d82f9f8e5e476ae3e5b1325
font_02_sfnt_off0001201f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1