Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a95cde0d4772a8a…

MALICIOUS

PDF

101.6 KB Created: 2021-09-02 00:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3aef2bc1bbde1b7e34eb8dbe84494f2c SHA-1: 53cf87d475e1d60d2cb46169825c31cc7faa5c52 SHA-256: 4a95cde0d4772a8a9b2b5d20bf6320e19653cf06c52661a777cf73ebc18e5003
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 WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cff3156fa---93884931029.pdf In PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef77e5153---notejorunebavezetuximu.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/bakosanukebumuji.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/depobuxoterizatiwu.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/68861579520.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/95294203814.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/zutizeloladoxaxaxuvexig.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a62b5863c---22371598987.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc19c8b890---fugikujonimapijonigasodu.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/tobakifelas.pdfIn PDF document text
    • http://meskerjager.nl/media/files/mulavebupezamazojoj.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b4e98e3ee4---susipuxibobiveximopurus.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/54219538773.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a5e86c672bd479d8a432c99685304b00/62657032861.pdfIn PDF document text
    • http://sdds.be/userfiles/file/jutilopoxigap.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7d165e4bc---ribapogagawizabavalesow.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/4687172786.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3dc509542a633d85fdcbd49498e02fd9/89138335739.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/31157021824.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/36109370698.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/7307856e015ae2671739ce31104d33b6/naxawolipigupetiza.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/60003953319.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/wobufux.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075bdf986163---sunuzibole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=draco+and+hermione+behind+the+scenesPDF 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_off000127b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCA 18584 bytes
SHA-256: 27f957243fa48eb405d8e965d5348f2ac4284bd944973603d0fd78a45cd2a7b9
font_02_sfnt_off00016fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FC2 10732 bytes
SHA-256: fb73d4d7cd76f9e7ddadd18add5ac8b66a38abef5b472565d960586374910c8f