Malicious PDF — malware analysis report

Static analysis result for SHA-256 e668fa05a91520a9…

MALICIOUS

PDF

95.1 KB Created: 2021-09-06 14:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7177c5d70420c27826489cb71b458d73 SHA-1: 89ea7a6814492cb46e3c46183cd74325e5a4f42a SHA-256: e668fa05a91520a920256faa98a12982f99cd64f7e0b8e8ea87a0eb55b375695
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, indicating a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/2911957oju8nj7d8jr1sskflio/20477177078.pdf In PDF document text
    • http://okmarin.ru/userfiles/file/saxofatutaxuvajewasubisi.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/sid4u4ght1mtprs2cffbfck2go/joxijisakixusi.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/1562753749.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/medumosirovovakedebini.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16072a9743c1f3---kebumokanagigoj.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ogf05ssrffion7eu9ripdulke0/85756243745.pdfIn PDF document text
    • http://chromavials.com/d/files/dazidogebulawabul.pdfIn PDF document text
    • http://bulmarconsult.com/files/61132126906.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/u88q3cpra1jso3vk60kncq69su/44721619664.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/4gt1fq60ec1b940fgck3vcndd4/90661116978.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b0e88f41bb34a03b7aafa0b4476dfd0c/vefepiwimatesik.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202107200920308232.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/8a4f5f22c6d54afa7e1b4f6422e76bb1/7288537108.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/49b7eefebdb43b71ca92b85eda26d63f/majedeku.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/dsoficl31ib3pfcrfrm55i0pp6/votajan.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07e7a1b98---63182433393.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9f586c13---lelut.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/jerimekam.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/85181eb5176fc0000ca45d8655bcd20f/84225542537.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/93033433392.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zinibilosebogogepeme.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/76163349516.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/541f662d153102e4dd853b899fcd9e69/34885673836.pdfIn PDF document text
    • http://aven.su/userfiles/file/4655511608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=essential+cell+biology+4th+edition+garland+science+pdfPDF 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_off00010a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 11212 bytes
SHA-256: 40d2f6f4ac1c7762ae1ef0043818d0828f4758d767984860d80a67767229028a
font_01_sfnt_off00012428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12428 19304 bytes
SHA-256: 3413fcdee09ebcbe1dbab1efadbcae0dd32690e52cc03fb8354c10f5f4922346
font_02_sfnt_off0001565f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1565F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1