Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa082724d9f6cda…

MALICIOUS

PDF

84.7 KB Created: 2021-09-03 20:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82736d1a28aeff3bbd1dc408e5030a2a SHA-1: 06aabed6e46d49b9e2092af369103c39242a1689 SHA-256: efa082724d9f6cda4bde1ab35e172654819fbb883d93a3e23e8ded969ab60546
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The file's primary function appears to be redirecting users to these external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=manualidades+de+papel+paso+a+paso+pdf PDF link annotation
    • http://www.oiseaubleu-promo.fr/userfiles/file/kutudoretuwulu.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/vn6dd9cm18s8tfp85tujml128h/90241970847.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65ba70574c---40898719651.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/togomukufulavatawem.pdfIn PDF document text
    • http://kingnature.ru/files/files/54080406002.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1611df1c9d6c6c---gividajiw.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/94926593463.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/14359181328.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/4499166915.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f502a87f7fd---sebanavoboxukejoligifenon.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/52550026522.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160850297ae359---rofefunuterig.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/63671582326.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965bb133ad8---busurowuripura.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090117523231.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8253db580f---duvazupimudef.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/nefig.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/7461421188.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/elbegcd90o6dp0qs0ttro6lj3r/nurejakuwikesogalo.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/99386138043.pdfIn PDF document text
    • http://cichanski.com/Upload/file/loguzozofuvasoxusoj.pdfIn PDF document text
    • http://furniture83.com/upload/files/42853571006.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/nogegadofiveror.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/48526029935.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/mubexidezuvu.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_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 19480 bytes
SHA-256: f18f7cea23f8e0ede2e026796cbd98ddac2d95ec1600250cc9683853f73b3a12
font_01_sfnt_off00011584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9B 10388 bytes
SHA-256: e6ff9d7b95041a66c81ebc5259fbf3c735b627933a960a0e65afa0f0183a1969

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