Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc445ae12f7fa78b…

MALICIOUS

PDF

69.8 KB Created: 2021-09-09 15:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b45c6d592bea271b6e12d44304c1847 SHA-1: 5014d5e2f53cdb66f9f1249e62815f03392a1087 SHA-256: cc445ae12f7fa78ba0af5b384f0a6a70cf978e01d54c9af2f32a79c340b563d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://sity-luxe.ru/userfiles/file/48766830242.pdf In PDF document text
    • http://studiotecnicopinto.it/userfiles/files/8695711889.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/saxewaliw.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/jujefefotawadafavagavimal.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/69895937641.pdfIn PDF document text
    • http://sinoorchids.com/image/file/tisubulotuxerinij.pdfIn PDF document text
    • http://fygl.net/uploads/file/0806321567.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/30497344107.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/75071309158.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/vejibaderisaju.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613116e61e24f---selurilinofib.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390af6a1c60---26701103872.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/40539117200.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/67081254663.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/97568089479.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/31971592162.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/miroguwepalujetejav.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/90262831222.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/zanowakuwivas.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902082528472031.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/55138082502.pdfIn PDF document text
    • http://iltorg.ru/upload/file/jusosisesifikela.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/vowegaboxi.pdfIn PDF document text
    • https://reha.bg/content/upload/file/26489529114.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/jesekokitoret.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8ceed057d812a52106f7e18c808aba24/80798301304.pdfIn PDF document text
    • https://kawanmto.org/contents/files/75124528880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ymusic+download+androidPDF 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_off0000b51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51D 14788 bytes
SHA-256: da28dacdef32664ea6e596cb6c6bd025f0477905c5080340f05e8ae4fe15f79d
font_01_sfnt_off0000d96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 10468 bytes
SHA-256: 45dce9edd9355ed7ae7a18882bc9e25db806580d9606b12059a9eb95cc4eb710
font_02_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1