Malicious PDF — malware analysis report

Static analysis result for SHA-256 7758e51a67e0755f…

MALICIOUS

PDF

76.8 KB Created: 2021-09-16 04:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8443719ae19d8288a5aa25b36fcb6ed9 SHA-1: 3773c55b71640eedd282dd56425548f83058a300 SHA-256: 7758e51a67e0755f438f17a663ab0e8228e2718bcb9d3f15740af490e4fdc42c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wroclawmodelshow.pl/ckfinder/userfiles/files/wubusugonupatidogewipusi.pdf In PDF document text
    • https://dollarplus98.com/images/upload/files/zezozifisusavov.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/572ea859b35791a355fe8c6d4dd78bae/wuzixojifeki.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/14747354052.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/wunizevubufifigokotogetap.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/mibibikedotanoxusavev.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/megodurolo.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae6dbe025---90539989030.pdfIn PDF document text
    • http://serting.eu/userfiles/files/53033780688.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/nalupefokujuxozeto.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613081b1a62fe---texokosiw.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/somajafari.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/bebomaga.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f63a03692---ziwalaxafowuzonogolox.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/wimikikatowufenip.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tb3o20guenqut6qfmialqh4rr3/99842484717.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1796714249613639ab8648c.pdfIn PDF document text
    • http://maksimetall.ru/files/jokesezodamudisinibale.pdfIn PDF document text
    • https://il-gusto.com/images/file/nimilazarizabe.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/jesabasopaje.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/zubafekogamurawurevavuz.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/vixujusituvivib.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/jopuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=torrentz+search+torrentz2PDF 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_off0000c9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D1 10332 bytes
SHA-256: 1a6159f0b379ab21e738492f8a84baa9abd4da3c3845ccc6c7df17b81aae76cc
font_01_sfnt_off0000e133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE133 17212 bytes
SHA-256: c580a011447e09b9a88054c5c248c4d72d145701f24e6f7d5b753724a7e44bc0
font_02_sfnt_off00010e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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