Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ae76dca1cb5b75…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 10:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 995cec83b40640ad98c8c41174c215d8 SHA-1: e93354e1ad49eedf83ab2e43d5af0f7f4c96cad4 SHA-256: a3ae76dca1cb5b751cadea5300536afd9d635ad36f99e411fbb31485602b7fff
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to potentially compromised websites and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick the user into calling a fraudulent phone number, consistent with callback phishing or tech support scams. ML classification and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://alompar.hu/uploads/content_files/files/22433191461.pdf In PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/rasetukesonap.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613674bb0c241---nusaravosimixelo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614013c59b96d---gevamazejen.pdfIn PDF document text
    • http://ternovykh.ru/content/file/998528093.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/tijiwemozejaxurajumama.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/9692669112.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/robuxikepitakopigodibidol.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/saxivegesutifelezafalafol.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161394b8360448---88784290242.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/fimuxerakaje.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/k9kikcbmo4as0bsbmfdo25p08e/sikapedajuw.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/38814112181.pdfIn PDF document text
    • https://alariel.be/userfiles/file/98004921277.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0e2e7813---dipelomewa.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/74197014019.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/retuzedimawuxomawasid.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/4450567357.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/74535090016.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/14373882026.pdfIn PDF document text
    • http://floramarble.com/uploads/14741880564.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210921004424855407.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/35176420626.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/40768874534.pdfIn PDF document text
    • https://acmfashion.vn/uploads/files/pokud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=robbery+bob+hacked+versionPDF 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_off0000b198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB198 10780 bytes
SHA-256: 100c115e77773e73978ad0cf940a6ec6672728dd731ea4ea36bcbc19e9bdb607
font_01_sfnt_off0000ca6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 15484 bytes
SHA-256: a5f06b7c976bd66fcb82269e862db57d09d37ec311ba3cb8439c4d3f203b3015

Open this report in the interactive analyzer, or submit your own file for analysis.