Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb747c314aa3acf…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 00:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf868692cc1a37b85c7cb6fd40402b18 SHA-1: 0e6aa03bb43fee053b01c5a234dff812cea68133 SHA-256: ceb747c314aa3acf5538f098dd1ad1e8f13cd35db74b52abf76ef34d85216490
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs, including one pointing to a raw IP address, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/0b87877bb81442d798c4ebea921b1b00/11629762985.pdf In PDF document text
    • http://kirakuramenandsushi.com/uploads/files/wakopofogutagoxeseku.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/sde141armcj356bsouqptmdha1/87548484462.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160913eb231297---4674334425.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820f1d2d3a5---luluzupumexupofoberujugi.pdfPDF link annotation
    • http://thayloilocnuoctaihanoi.net/upload/files/gubowiduzaka.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/28502574936.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add23f4aaaf---jesamofu.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/bitasudolekevimoguxe.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/bonobebegurabigirazixeli.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/23733d6efeab5157d17b15f9a8b70b55/70433658055.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/sapagoxa.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/36c94f5c0ec4aabb0b3afc73a614b307/jamebezifav.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/25293646982.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/9810646215.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/44797254286.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/f396391621add7a69b877b523c82ad56/55827426454.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160750a28f2f58---33536540353.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210822/file/16295972647315.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/62696772974.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/nawelusiwuvotininoxavo.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/9614693201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=oregon+rm338+projection+clock+manualPDF 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_off0000e050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 11276 bytes
SHA-256: 3401fde67e24eb1cd01144c527399d41e4f6c9b2f40b040d9ff380761d85aaaf
font_02_sfnt_off000112e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E7 18616 bytes
SHA-256: 8e26d19df7cab918c1857eef7289365f094b78db85c74ff761a38c24fa8d12fb