Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1553b843d15121a…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 01:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 793b7a5c9b05fedce67a45dabefe8db5 SHA-1: b15a8c5fca72d41497046546e9d6ef77a42418e8 SHA-256: e1553b843d15121a0ff8a49a0ef147f77ea4af4e978252da21d19960f6e6ddac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bestbuyfromindia.com/userfiles/file/77252474072.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/visegatopufozutoze.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/kefefopabokusulixujimepi.pdfIn PDF document text
    • http://chongros.com/userData/board/file/87788090529.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e8b14de4f4c33bc9640ba73600da538a/vudekexedulosifanumowune.pdfIn PDF document text
    • http://juraganmonyet.com/contents/files/69404393571.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210905_051450.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/gobupabejeliropozijuteta.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/daniwevukabijedozarupun.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4c3bcbff31363752eaf8235b9996ed04/56510849503.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/298482776.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/42ru11due75thledta2ok0ndr3/79800410642.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161315f41949b3---73117561233.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/luxaduwikupigugogikoz.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/pijigixarifokukulofu.pdfIn PDF document text
    • https://cristalensi.com/public/File/bopejisifixomewoj.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/gazazijowaxup.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/litulareduzegofijikoxik.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/lubavareteviwaxisigon.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161306585302cf---lazagupuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gta+v+cheats+unlimited+moneyPDF 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_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 10856 bytes
SHA-256: dd29648d48ce3ea924cfbdb4a045e40e8b67d3c9dcdbc9772b91cf7249b66408
font_01_sfnt_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 17976 bytes
SHA-256: c557f8d8bb0f0fb43018b348c90a9cbf87100f799e9f255b3c7fa9028fb10f6e
font_02_sfnt_off000132b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1