Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c09be13a61450d3…

MALICIOUS

PDF

74.3 KB Created: 2021-05-22 20:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e84f7b148c88ba53f3eef7ee539a0815 SHA-1: 469f9e197f41c25af2761a94e61f323257eb865e SHA-256: 3c09be13a61450d312fd080a9b66c4a95f1e9e19d4afb574db20c27a1a2f5d9a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=how+to+enable+ecg+on+samsung+active+2 PDF link annotation
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706668874fb---pukuratedife.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/34e9aa0309b3c0312df4cfb71e2955c4/10380906976.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/9818077087.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/44fb16111c5b8fd1066fc8de91ed8a28/90136629487.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/cf83d5f83513574c9842de0c3391c496/32420155068.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9524b0d5a12953929c0e2f4879fb882c/vevozi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0f192e9c---tajumusodamatas.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/golubopepa.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/3akj619qd4l4anh5nmqvfu6qi5/gilevisafikavuzifizuxumad.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160812649503be---1921826610.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/uuph0d882fgm40lncm1d1lekms/doteluxifamazojafu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3723cec44---diwanesedegefezalomuzoje.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a66a214cd96---24984506885.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ic4me94g9k2j0rc0i2r9ektgoq/xejolikuwixakolo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 5288 bytes
SHA-256: 554d4b80976f9373c09d6444480a64e98ea90a2184a7fb4dff830f18519f8228
font_01_sfnt_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 10648 bytes
SHA-256: 388791e5053f0281978b174cc4c1d08d690271e9d833966bb6b4caa636223a7b
font_02_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3