Malicious PDF — malware analysis report

Static analysis result for SHA-256 827a890fed01527f…

MALICIOUS

PDF

90.1 KB Created: 2021-09-03 20:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d81e0b426f1a75c58be542146ba39b82 SHA-1: fb3eeb9388cbf62b093d46e2a0f52058e40e472c SHA-256: 827a890fed01527f4ae2ef8657c848e5ee9a4a9bbb85e2c043d56f3d14344c6d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://fsbulletsandbrass.com/userfiles/files/nunovisuzununilebasevivo.pdf In PDF document text
    • http://tunecharts.com/userfiles//file/muvafurisifuxezakokenuzo.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/nafunukororakobo.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5c406d2f64a11d1b59a84ef93fa40c7a/pamefotuvumomuto.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210809113515185.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b704c64d1---99539094623.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210806_210421.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609479e95e58d---35022247750.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/birozikuk.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dab686df8a2---lajogojibidakiwapebe.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c422b485ea6---gimevoson.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/xujupud.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/jobugidivux.pdfIn PDF document text
    • http://chongros.com/userData/board/file/fagifi.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/85552959862.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01cf5dfebe---2255069270.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161137f9ebb772---26003583828.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/73929953216.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/78485471482.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608012533e24a---1550466330.pdfIn PDF document text
    • http://talleresjpg.es/img/file/47726577337.pdfIn PDF document text
    • https://norservis.info/files/files/25852143922.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075b319734a5---daminexetumitez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=manuale+di+cultura+generale+pdfPDF 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_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 17520 bytes
SHA-256: 5e4dd1bd4cc4c9663387d4d2a1fc784b8de21a1483a07657cccd8768cff4252b
font_01_sfnt_off00012b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1E 10600 bytes
SHA-256: 2fc904d507d72bb28462ba115e2282e21deb9a26c63671596b4b3a701c549482
font_02_sfnt_off0001432b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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