Malicious PDF — malware analysis report

Static analysis result for SHA-256 652a31a23a11a488…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 21:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e61293cf9887a392dec39cd06ebd837 SHA-1: e489758c86df524c169f408181905dd384126c01 SHA-256: 652a31a23a11a488af95a12fafe0acaf4506f7cbc2f0c5d8eb501066e8b0f782
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=the+power+of+now+ebook+pdf PDF link annotation
    • https://nileagriculturalindustries.com/file/14953355492.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/kemavakejafut.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/xujatizemamitu.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/newujemifezilafelekil.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/sokotutakumivumipodosu.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/49112087738.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/88534502635.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/dufezukanoranubigekag.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/fufukobonoxufusanep.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/nufagusosamitupakefeni.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/21421213113.pdfIn PDF document text
    • http://boxethai38.com/upload/file/23903054160.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ca70c1b76d5cebd439907eabf1f17adf/28092711536.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/13180989071.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/18937397827.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/76471516804.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161434fd345002---43834214509.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/de4169fcc24a0262415f039345a1c4be/83724957216.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/55723766238.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/73772976073.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/60788172467.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/rujukifuwudasawafiwegi.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/13210642021.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/xefor.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/86510003632.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161329071c2484---juledelinomukix.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_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 10312 bytes
SHA-256: b0473da9535f29b2432c026aab472f6ec39e36dcbaf0e307f1806b66b4c05456
font_01_sfnt_off0000f558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 18812 bytes
SHA-256: 94a3b7e834654a2b29d54e3605edc28339d0c3a7707450a43770810cf8d55141

Open this report in the interactive analyzer, or submit your own file for analysis.