Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f925b460bcd30d…

MALICIOUS

PDF

74.8 KB Created: 2021-08-23 12:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01814de8199889ccfb8c0bf864f9ac9e SHA-1: 49fd70b4df0b027401fadd19c63d3631fa459c4e SHA-256: 26f925b460bcd30d39fc1f00089f4faf49c724695fe3cf77e5b07f92c0c0d7b5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a campaign to distribute malicious content through a chain of redirects. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://7seapharmtech.com/Uploadfiles/files/xumapekuvusesuwoxab.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6debdc30a3978f24a8435ced64992f5d/rivaretebedu.pdf
    • https://jjcfurnituremaker.com/userfiles/files/xemezux.pdf
    • https://warungmimpishio2.com/contents//files/samal.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/29c693426f494484e0b0b1f4929c3208/30220683673.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef1a9eedd5---vilipozipimijamewazosa.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03050a2257---sunasofusivofizigizokonib.pdf
    • http://canvangdientu.com/images/file/49331153455.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3748fb4ad4---xedatupuge.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-10/20210510031241393820.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/60429569760.pdf
    • http://studiotecnicoforace.eu/userfiles/files/lebepiregido.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/h22thnr26r4vd1qgt7e6u1u5vh/55731705278.pdf
    • http://bernardthevenet.fr/ckfinder/userfiles/files/lofixaf.pdf
    • http://posekatzahradu.cz/files/file/10824940892.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb472ca33c---toxipefesegerulukopuse.pdf
    • http://qbcar.ru/ckfinder/userfiles/files/moxovosomotukatog.pdf
    • http://allprintusa.com/admin/images/file/75590999989.pdf
    • http://slsnn.ru/content/file/befifolememopukogoso.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/60361172058dd0a98a2b4243b3f3d908/fowusakonewigiwer.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160752b4590873---pemogekenawurud.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5cca886c00---zipawimipesokifuxemaki.pdf
    • http://studioarchterreni.it/userfiles/files/17703969319.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/bcmc2vqet31jgmjup12309ora2/29156475747.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fll+to+acy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BC 16792 bytes
font_01_sfnt_off0000ddd2.bin
01e278dd096053cad60aedf66b383af6646e47287222249c653f5d1ed4154d4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 9716 bytes
font_02_sfnt_off0000f32b.bin
7100da61fc65d4e399b7f58ad43e881f6089279888b0d7e5466ed9892c11a8c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 16592 bytes