Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac004f4857925a51…

MALICIOUS

PDF

68.4 KB Created: 2021-10-03 22:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dcfe091ce8dcb9ac7c0583cd08240e09 SHA-1: caf2d553eb6a899402ad6c1775c69599400f41e9 SHA-256: ac004f4857925a51672a9c48598567a71d23094e8e86c553565966ff8d92da83
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 domains identified as compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://gps-ambroisie.com/ressource/site-image/files/fafasevavinepegivetupobi.pdf In PDF document text
    • http://3bbb.fr/ckeditor/upload/files/dusejopuzarulamuludub.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/lewoxajak.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/bubaluzulirevirarukofi.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/62657766133.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/94746611547.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/vuvutulidiwigojegete.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/16174153642.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/99817288457.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/xutubuxivobob.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/15902650327.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/79994609206.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/49994150036.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/9g5gi5ofh8oacu80t3gackugs0/58603596973.pdfIn PDF document text
    • https://masihpt1.com/contents/files/39642336020.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a5bb51c245f2d3ad6c0089a23333395a/12637384490.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/fiwagarazoxobisegameruxo.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/jiwes.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/bufofoko.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/xomizafevuko.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///jewezimenow.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/19915889993.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486d11d8272---nejotunekodejesamemabipub.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/lewejumopud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=conditions+of+worth+in+counsellingPDF 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_off0000af30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF30 14692 bytes
SHA-256: 220dd0bf3c0d303c985d3f82d9053ff8e985115ff67e565e9fae6ad3d70fa7cb
font_01_sfnt_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 10812 bytes
SHA-256: 57e35648346873b2cde13f6dad452a22f69282ae0d12a7d0d2343ee2170cac18
font_02_sfnt_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1