Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5362a30b3fd721…

MALICIOUS

PDF

77.4 KB Created: 2021-09-16 14:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10faa6a0f967836cf00c6601478da80a SHA-1: db7467ef8d3c71d040193548a3051e27d0c58f6b SHA-256: 3c5362a30b3fd7218ace973f53afa88af3eabb6ba8e5bd78a25de769c370f1c6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://promenade-perpignan.com/userfiles/file/jegozelebolovukapa.pdf In PDF document text
    • https://dananeye.com/uploads/files/202109062307121048.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/434b7350aa6a3ba14ddcc3e1332acb54/42408868670.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/kovaj.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/mupolarunos.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/juvomugutagijinedoneta.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210905202955.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/50454737760.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/tudixanamadavo.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/sodisoxa.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/8461271632.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/bonazizoxabudatiwapilet.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/zenexixidunaneworejo.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/49692419501.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/koxonuweluzemikaxitemot.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/dagunuxesufuzomes.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/95929339729.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/83016219833.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/fefijokesuxupod.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/63932023527.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161408afff00af---nogadalumusavoxijubi.pdfIn PDF document text
    • http://usagimatur.com/files/others/nesoduxupixozuxirutupenab.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/nopodore.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/xikamitejekujadetiwigediv.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614112a81069b---68016325186.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/29085435075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lion+king+2019+putlockerPDF 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_off0000c793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC793 10828 bytes
SHA-256: 9b1e6f27563e74421158967f9a6bd1a86e4f8d4d935409f63c1b8f28b48b4695
font_01_sfnt_off0000e0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 17764 bytes
SHA-256: a2f9e06ef61dc428953a6c743a13295ed5d8e25566a3ef9bcad96d2ef6a7a5b4