Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d79faa3a82ebc4…

MALICIOUS

PDF

74.5 KB Created: 2021-09-14 12:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fdd8a6903c68c1e72f58dbcfb06e0ba2 SHA-1: 942563462fb96016675d583cbb8c47a1a8e6e251 SHA-256: 25d79faa3a82ebc4fc8272a25de7aca01c0048a7c36ad2263fc799404eedea63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://globalbando.com/DATA/upload/files/202109140733245866.pdf In PDF document text
    • http://alhambra.kopanramen.com/uploads/files/67927764366.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/17379530999.pdfIn PDF document text
    • http://klinok-saintp.ru/files/renereratopujufefiwup.pdfIn PDF document text
    • http://domplus.su/userfiles/files/70712648002.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/sonugepivepukadezaz.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/89110465815.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/41164047218.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/jagut.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/tumulijabemejivuna.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161327bad8ee44---nufomexekirelazivasuwada.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/2635856032.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c9dd3ec23d4035cd826635971ff86ea4/petelak.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/59604573726.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/70565714478.pdfIn PDF document text
    • https://mmtours.si/uploads/kimakujejokuz.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/89812467355.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/18894015036.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/13179305805.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5n8s4k7haeviu2804las5anmsm/lekexuwesosegotetu.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/napirajalebezatax.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/8827081423.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/95894377411.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/48250039301.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132e243e821c---87703333263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+fire+red+game+file+downloadPDF 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_off0000bf89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF89 10612 bytes
SHA-256: 0eeae59824aeb2cb67e205e47cf6d48857f6ff3d55346c853fea6e031848680c
font_01_sfnt_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 17156 bytes
SHA-256: 0b75eca48524c48e33a007d37d2b4c2c784386f39fa88534b6a6fc196f193d06
font_02_sfnt_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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