Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1616c7c1c11c30…

MALICIOUS

PDF

81.4 KB Created: 2021-09-14 13:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 815285146b24cdbd61088af1c35637de SHA-1: a0c402310de988b83ea45260fc7cc899a720c532 SHA-256: 4e1616c7c1c11c308aa103c51d898e9029f82d02bdddf184fdc4ae330d2a3af2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs pointing to compromised websites, including one using a raw IP address, indicating a phishing or redirection attempt. Heuristics suggest it's a link farm on disposable hosting, likely to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://przystaneknida.pl/data/aktualnosci_imgs/file/93479829363.pdf In PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/4d1cfb12568d870b78dcf7b47cc14482/42418620076.pdfIn PDF document text
    • https://media-get.com/userfiles/files/1884813451.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/498a31893edeaa76fa5ada9252e9db6a/20535159301.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/92048638816.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/56467019250.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/68433620117.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/2918299549.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/81666470318.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/81281757098.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/nedebitu.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210906214251_ouml4r.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210901092316.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/kokuwo.pdfIn PDF document text
    • http://rcot.by/pics/files/zesatubagew.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/975d71332ff7e922f14e243809a9b277/48843846775.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/kujosufugapunu.pdfIn PDF document text
    • http://ausafe.net/images/art/files/14730775355.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/savawute.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/36749072298.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/70332902884.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/63890655271.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/zagiwajufujetewuwire.pdfPDF link annotation
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbe6a358a---pelisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dela+paz+pasig+city+zip+codePDF 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_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 18212 bytes
SHA-256: 090fe7a23dc2d01611318d6ff26d6964a36e4b13101043d044fb89a5a36bed30
font_01_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 10660 bytes
SHA-256: fc55506f9969f2921eb42896adaef42f36a34e2cba2b35de747d55070ac000fa
font_02_sfnt_off0001202c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1