Malicious PDF — malware analysis report

Static analysis result for SHA-256 576903e77be6f5f7…

MALICIOUS

PDF

91.6 KB Created: 2021-09-06 00:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7088794bf7098f8cbb5322efa315dd34 SHA-1: fc95476e9d4a67ce0aca3b0266ddbe18240ee821 SHA-256: 576903e77be6f5f75325628d7903f4a5b9da67545aa2839c279d23baa4f13cce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://dacinsara.ro/fckfiles/file/bapexoxapeja.pdf In PDF document text
    • http://www.siposferenc.hu/html/tagusikiruvusawikexil.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/29399009985.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d639b307c62---mudures.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/14320750012.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/64510011344.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/603fcbd836a72bbd6b19fd168f7be628/92236462338.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/42631597757.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/52894295015.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/3063886024.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/wutur.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/6805b931923d6876364ebf25ea6de267/50207420865.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/69437949314.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/nelinilavesawi.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/netenifisafa.pdfIn PDF document text
    • http://nfc.soo.jp/file/89169828322.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/fetikejujuzabotorot.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/minasaxe.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/solovasuzubeli.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/nakeviviwogunojevaped.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/22078284121.pdfIn PDF document text
    • https://latework.cz/soubory/susibaw.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/smhbbrc3vf6v46i3du6bbk1il0/92488129661.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/tedasupof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=manual+focus+lenses+for+nikonPDF 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_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 10416 bytes
SHA-256: 3cfdd7b48dca5be549d7c31c7166f9642a892b7bdcd1c5cb9afeb059fb4995f7
font_01_sfnt_off00011627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11627 19192 bytes
SHA-256: 0aab5a699c94b622a2da68a31e80ba6eba892367aeb6c3dcd461d3c793c27dd7
font_02_sfnt_off000148a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1