Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d4f0d048027ac4…

MALICIOUS

PDF

80.8 KB Created: 2021-06-13 09:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5ceb028696e689f92e8537264a9dd9b3 SHA-1: 20031082275d3efbc95784f844858cf57f2c1660 SHA-256: 76d4f0d048027ac452304d3212682dfe0c136245cceb27d5d84e0ff76bf011b8
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 https://pixomot.ru/uplcv?utm_term=rainbow+six+siege+free+activation+code+2020 PDF link annotation
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/aiovfhkdmj6evq8dnaqkv3o899/ludoxakebaximegusi.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/15288753593.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/wodolewuselemowatufewe.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2a9043bb3da32ca08455c4dccae9cfe/12833696107.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/masiwubakiren.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c268738ecbb---tavogolodotazuj.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/5c5mvos3490p27mc74hrc35t7a/98683886945.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tuvuzudeke.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/28081096001.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/566c6cb0b62c206e2c08b6484d456713/mivub.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/33876995421.pdfIn PDF document text
    • https://loctra.net/userfiles/file/62048381283.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/weposebuwekixelurabama.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210527_7501BDDF52D0A993.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/dehsjgoutgu1fd7dvrra590dlr/71627380624.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 5796 bytes
SHA-256: 35b188c4fd60cf1cc9e0060b1affbd1b7f2a4d7ae152325e62a00ada2eb593de
font_01_sfnt_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 15336 bytes
SHA-256: 9ed536268ef0384a99ff68b57290915c13d6355fd46c25acef5734c695c79505