Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a652f8d9ba7328…

MALICIOUS

PDF

103.6 KB Created: 2021-10-19 02:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9770196c430a581bea29a42d05c5e1e8 SHA-1: 0531159ab25e3745107bbf2b85a832a9d93a3a7f SHA-256: 93a652f8d9ba7328476cea30f36c09a4c1a592a8e59530f29e8220e878435393
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1616c227b0d899---32441081502.pdf In PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/93746805830.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/60695824572.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tudosan.pdfIn PDF document text
    • http://faradbox.pl/files/file/nufefubewewaboxuj.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/2721946288.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/mibubunos.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/49766099144.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/xuvaxuninudifimojuwusux.pdfIn PDF document text
    • http://alvitraders.com/files/zedigifujupadimotuw.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/33491575345.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/tabumogonujelonoxopenuj.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/43089282813.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159466de9bbb---jupufopuzuwasuwox.pdfIn PDF document text
    • http://mopron.ru/upload/files/foviwikereb.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161680a1e91f27---98764225765.pdfIn PDF document text
    • http://allasclub.com/campannas/file/sufugawukavawasorut.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/17724529648.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/vadoxupokirowogivak.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/visogagi.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/vilusug.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1634357297.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/b15f720f7f1ec451e1362d3c64fed69f/kiwajibubujunu.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/poneluzanefofetufufive.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1e5573109---vifulotigevukolazegudomem.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/5171658580.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/EqozwcbAC44/uplcv?utm_term=ws+6.2+nuclear+reactions+answer+keyPDF 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_off000128d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EC 10964 bytes
SHA-256: cd9e748bcfd403ac9a37276172ec97f5e0818b27565034e2da2b94f04c7c75a6
font_02_sfnt_off00015aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA5 20356 bytes
SHA-256: 72695912d74ecd0e184643b3a8969d5a80d1d35c6f98e78642d6ac6acc71b2a2