Malicious PDF — malware analysis report

Static analysis result for SHA-256 f621f14bc92851c4…

MALICIOUS

PDF

86.1 KB Created: 2021-07-25 17:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b55aa09fce7176f72b145b3d3bd9613 SHA-1: 5a58bc5e0c080b02e897a15eae5dc7a603368d8f SHA-256: f621f14bc92851c458df8d478f811dad3897e343b7de8c0282a954732ad73eb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack where the initial PDF acts as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mariapolis.net/ckfinder/userfiles/files/31306839752.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/cgf9v37ga6s4gbltdd9214qiug/16526299424.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ac1e8624d50f11527c7eaf7ee443454e/vijekuseposuvelaberitik.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/tijux.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/98827257995.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/68251361917.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/8304977646.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eff6b8c3c---gagosevupijorivilenorule.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/kusediwovemunagiwebop.pdfIn PDF document text
    • http://intergeored.com/upload/File/kidogisukaj.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e696ec389---92716968602.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b4f712137---musekezoligupexevuvoj.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160779ddc0a63e---7822915806.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/tanunope.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/qlcn7vaeu06glbp9gs0nvkik64/gomanupuxuzosokisidu.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/xemojorowoka.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/57215948789.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dbd1d3b4d---48792974378.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609389fff0118---27230409552.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/41999330604.pdfIn PDF document text
    • http://www.emailposte.com/pictures/65609362871.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ced9110c8---nasudizagules.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1960f45e87c0c73317e4ab9cfc9421bf/34304139370.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/523a921b1f6405cff7d1c79b3e594635/kotogidadesiresinof.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/8717ia7k3q85n1pn60d6p7biuc/wovakawaribog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+install+ring+doorbell+pro+with+existing+doorbellPDF 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_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 16620 bytes
SHA-256: e4e362828f94e0937c14327f15d627a3d7f28b0944dfbeb82aa44ed089e13e6e
font_02_sfnt_off00012f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F99 10988 bytes
SHA-256: bfeb62e3b57bc20f0939237a502fceccaa94124bfd4cdd5f5c59e4f78fad9185

Open this report in the interactive analyzer, or submit your own file for analysis.