Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e38ef5619c39d76…

MALICIOUS

PDF

95.1 KB Created: 2021-07-24 16:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d85fa7b13a217e50c6d2ae6d2fe223d7 SHA-1: c71e125208374f0cc4fa58e06811048cce54ecc1 SHA-256: 9e38ef5619c39d76366ad40b67454f68e2950c2da670ed2d97d2483b000d77e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains flagged as disposable or compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://ontsgoi.shop/uploads/files/getusobiperidiz.pdf In PDF document text
    • http://gilendor.cz/userfiles/file/melipenutaxuxoxonix.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/mutenebi.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/14680178329.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/ganenisi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adac60f35e7---59266003972.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c144605e591---wetesubugupixisorusagus.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/vijufusede.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bef5f9cad0c---rukiladabizabate.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/3t62jbbn47q22p5vholhjn2m77/8132067641.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080b94f614ea---1872110316.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d4698938f---niviwemageba.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/pumusonepatakotunafij.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/gajakavune.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/23153658344.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/lofadipifiniwutonas.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/hjat3crvnhor3td8t8ps70ap3h/4737773938.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6c47aef71---lijabutanizimijo.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4c6638153---kekovopojujaxumimalutibu.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/womejigimoxupaledogize.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/7688530507.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17c14e8957---22651031263.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d60dce4d7---67874359792.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e00224e1---javifumijenu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e2808108c40---jofaborikex.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/2169415022.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e423e6b5a9f---fumojapo.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/jujamofuseja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+complete+rubik%27s+cube+step+by+stepPDF 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_off0001102f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102F 10824 bytes
SHA-256: 489efd9d94b9b2d32cdb224cc9e7a76e95c8a5d19210c2e3530595a2d5b0f3a7
font_01_sfnt_off0001290b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 16724 bytes
SHA-256: d380d72f6c35e73a057cd5c9c582a6937ad7b900f069d141d2489116c9f81cb0
font_02_sfnt_off0001546d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1546D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1