Malicious PDF — malware analysis report

Static analysis result for SHA-256 923ede13733b061a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 10:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 66f900e80f58e4191dc7bb9834d994b3 SHA-1: 9199046080abbe3a8e4774d3b1afae0140bc5fd3 SHA-256: 923ede13733b061a1aeccb2c9789e5da6646394285497cbc13f374eac07109b9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a tactic to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://uppersanduskyrotary.com/cms/files/File/56590767568.pdf In PDF document text
    • http://airfa.it/userfiles/file/gaguxokiv.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/6eada24de0706edbc746f6537b9a4817/96767795602.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/pubopoti.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///dezovuze.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/82532549056.pdfIn PDF document text
    • http://arslanemlak.com/E/file/mijazelipakegukavove.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/56199868642.pdfIn PDF document text
    • http://hotstamping.pl/files/file/wuluxixejinu.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/fujafexujoxivana.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d018aadc084---71407186326.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/tibezowavolupov.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/gs69ee4a989hb3h3gqb8p7vqse/70395287665.pdfIn PDF document text
    • https://windsbs.biz/files/file/narazevopemanomixaxubuf.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/kamilinis.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606da258402f5---77089379367.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/tedagegidotexiditelotag.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/04r7tp7j8ojp0h5dluuqaoss50/38084780317.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/38988125470.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/bc07523d0592973a6560380310a76d8c/35829014770.pdfIn PDF document text
    • https://digireg.pl/upload/vitezaludisarake.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/74889286523.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160891e83df59a---76423874964.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/27caae58c8ca6ef33dc76e0b4aa29e4b/32377701239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=entrepreneuriat+social+en+tunisie+pdfPDF 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_off0000d884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD884 19548 bytes
SHA-256: a9595109dee5ba5cbf484d46feb19bd3d903569dd0e6976d2b4836ca9dc86acd
font_01_sfnt_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FA 10696 bytes
SHA-256: ea3eb8e519a2490cb1b5e80e25728f4639c906266f6e69b96d806ebcc613f6f8

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