Malicious PDF — malware analysis report

Static analysis result for SHA-256 663ca041a12b61dd…

MALICIOUS

PDF

74.3 KB Created: 2021-08-22 01:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 81957813cda57d01e208628d469770e2 SHA-1: b8b5dfdddae201e46ff77d4bcf01c1269abc5b02 SHA-256: 663ca041a12b61dd3bcae8df1e3360d46d621e97ebf518af3760e201b56765e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting domains, suggesting a phishing or malware distribution attempt. The document body was unreadable, but the overall structure and URL analysis strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://t-p-fortune.com/userfiles/file/60211881148.pdf In PDF document text
    • http://amandatravel.com/userfiles/file/zatuwewefenivo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608251e712044---10591123908.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/90ed91ff2803dfb3f3258a3f6990e59d/ropejafodekobebozobomu.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/mudusosewutotapados.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/7062891048.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/15992229859.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/13196611377.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/61806321590.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0b13a5343---zavaxenew.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/56360699449.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/51344425918.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/670434043.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16107bed40d33b---62641865367.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/26130908191.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/fuxigisiki.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/58843155465.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/wesataxedon.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/givegatipujonixosazu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b850763cd20---14185048872.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/gezez.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/lrh730qqhkl35r4qurv891p44b/7595525939.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/35525096984.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a072b2dea---55045924501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hai+gia+vinta+la+causa+pdf+freePDF 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_off0000bf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6F 16232 bytes
SHA-256: aa970aed45931248aa4c9e5100d7a06c54f3926601fe046c2399ae0f50fe0514
font_01_sfnt_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 10832 bytes
SHA-256: 2b20ae83e3151725aa2111352efe16b9dfcd8e04f827f04ef3b2711fcf09e798
font_02_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1