Malicious PDF — malware analysis report

Static analysis result for SHA-256 45367672ee55e181…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 09:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c8e6971fc9c1c1ec8502bd523d67f13 SHA-1: d394f7b62fc10cf520ecdbbb171ddc21405913be SHA-256: 45367672ee55e181d23421476bb70972b0a29253a46c16721b516166f0e68be9
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially malicious PDF files, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. No scripts were extracted, but the presence of external links and the overall structure suggest a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://henanshuangxin.com/d/files/20070665666.pdf In PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/64350032265.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xapevopoxawurunuzuxupu.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/risavuvaxoraku.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/fadamujup.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/64193733277.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/87231459351.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/bavigunatuzoxa.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/papunagulogiwezivem.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/wazopozawobefesekimor.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1169369a31e7ed98214f0a571d95ef2f/wuwuda.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/24060448725.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/19eb3dd638f8c2a86cd85c3e1e61f4b9/33651744791.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/sojavowufazaparevekava.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/5130464806.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/vinudaw.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/kubotivipuminatodapofet.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/59117793834.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613848a40f10e---83771888257.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16305193386756.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/16525458120.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/duvurebijuvusuxudajoluzuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=watch+droid+amazfitPDF 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_off0000d580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD580 22060 bytes
SHA-256: 8e7c830440776e964259422e9dacc6f1caeafe735c53448fd78892ec462c2c97
font_01_sfnt_off00010fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D6 10344 bytes
SHA-256: 05f9bd4961b19d55051823dab8d82e98109da353cda66fc5c353fe48afe2414b

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