Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93d25a17f143539…

MALICIOUS

PDF

88.9 KB Created: 2021-07-20 06:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 75288d40095bcdbdac0019628391de8c SHA-1: eff2df38218bf3b684dc93c619f9ff2114db35f5 SHA-256: e93d25a17f14353901a8aa42baed94a67e16ad835c6daf374a6a33002af69472
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous links pointing to compromised WordPress upload directories and disposable hosting suggests a link farm designed to distribute malware or facilitate phishing. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely intended to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608687cab9658---fixoviji.pdf In PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/969934d30b54c896dd649279542a6d86/zudizowime.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083817113174---gotejinapimo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-29/20210529183710541441.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/fulasaberowefoxaves.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/65cd41cedd799bb54bc32c7f18493766/3925164758.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609239c24dbea---63464176964.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/27368602392.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/sipasa.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/32468164678.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/nasuhouhfuv1hr87n9iu1r1eg6/36855542938.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/xilis.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/wopenuvogewuwaxujiwoja.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/09abd07b01713f0b05b2fd604035e903/10596869366.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4ksjruh6rsrgabia9rml3o6qhn/15613629525.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9b7c2a30878d1dff63b9a9982efa3a0f/55409887339.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086999e23860---mumivosone.pdfIn PDF document text
    • https://tipresentoio.it/images/file/lurekatumutav.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/45053855245.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/98939424462.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/sesak.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7343a37bbd6aeac9dbad46c1e281150a/nufebu.pdfIn PDF document text
    • http://medi-sen.com/files/files/41180680073.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b8584d259eb7859971ab9cede15a7f9b/tukemovigirex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=indian+economy+by+nitin+singhania+pdf+downloadPDF 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_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 20268 bytes
SHA-256: d16f2583753a42e3071fe0e581b5c7a7c935ae2297bc2b3cafd442bd75c39382
font_01_sfnt_off000123ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 11256 bytes
SHA-256: 7b43d5364fdb166411311d826116adc91abd318bfd9371b13447ac9c6f5fe46b
font_02_sfnt_off00013dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1