Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf38aac3f71f06f…

MALICIOUS

PDF

75.5 KB Created: 2021-09-20 19:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01c553d43bf1cad4119147e0361fa50a SHA-1: 287effa300c69add5be176779b39b82ff2e3c913 SHA-256: abf38aac3f71f06fcd2a8a9450ec94cd14131d940f644e264d92a247afd202d5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised or disposable domains. This structure is indicative of a phishing or malware distribution campaign, aiming to lure users to malicious sites. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cnsgafgl.netsociality.com/upload/files/52988020607.pdf In PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/wopesi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/blh9fet6jtld6p0m0082rolau3/11486532577.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/kevidifur.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/14587990525.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134614d23841---77646928079.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/21174387227.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/84575331061323b48784a7.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/66288160977.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131692fc8251---rofetewubefupu.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021091015495243.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161442f9c91909---8116456012.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/84049978822.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/18210460846.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/dokaxe.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/dinixemazuritedisuwuma.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/subujewafalokozut.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/21217967929.pdfIn PDF document text
    • https://aildf.in/userfiles/file/11958784474.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/46af2a339608bf36c5a06f6af41c9829/80835979282.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/75775241342.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/wiwojizavov.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/renipipusimirafade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=titan+quest+apk+obbPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/rilokezu.pdfIn PDF document text
    • 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_off0000c46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC80 17252 bytes
SHA-256: bfe228aca4db7f12665da55eba7427bcaa09fecedb15f65836af6c097b6ff44d
font_02_sfnt_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 10540 bytes
SHA-256: 72b616d69517141f99aeeff23613371d0108cde464b6c77b630321957e4a4c8e

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