Malicious PDF — malware analysis report

Static analysis result for SHA-256 2577cc1b948ced49…

MALICIOUS

PDF

94.9 KB Created: 2021-07-22 00:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f29e5958efcbed303d370c7d47123b6a SHA-1: 570010ba39090e9d992edf8e780c20f81b9117c9 SHA-256: 2577cc1b948ced494bf83bec2779a973b196c67f22f50fbedeba8e28e8fb9762
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics suggest this document is part of a phishing campaign or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://businessvaluationapp.com//fck_files/file/95330303067.pdf In PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5034d973f87023dd3a09bb8bd35a4b29/buluzobikanalumu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdd4fe02d3---56874804348.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/62921714027.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/46073400288.pdfIn PDF document text
    • http://chinahongji.com/d/files/46310192623.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608208e92e9b3---potefigiruveravo.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9072bb343bde4d8920ff6f75d7c8900d/gurefolavaduzowumopiwavi.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/5dbb291730f4ec0b0dcd36d6de1b01da/84286271992.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/77585113198.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/51386179720.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/fowozoginewuzoruzarotapug.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/51432938048.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/87885036855.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/tb06fti2f413ftr60k2i9n5o57/1569768250.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/33904974208.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/57868239777.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a553eb265113f8735c8c52bd785f2eae/14758613882.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be986593a14---33058491850.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/bbcbed45687b018052ad6cd74155cc35/66564119631.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/lpij2q7v3fufh5qc43npc7uuo7/sawame.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/11053591383.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/558495ef77d119fbc38d69fec6091ed2/velevudazufin.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/24418430497.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/oufa443jdgp97jvnmvajo8cphh/95672832600.pdfIn PDF document text
    • https://anfauglir.com/images/file/44368144052.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92aaeccb2---jerepakosibare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=motion+to+strike+punitive+damagesPDF 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_off00010f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001273f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273F 10940 bytes
SHA-256: 6c0475fd43cd103ffef8349b1c27c642f82639f32a1cd13b39a73bf49ab275c5
font_02_sfnt_off0001406e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406E 17104 bytes
SHA-256: 0276ddb4ee58fd4bf870ed378e73779aebe483019270c29f5a34af6239caa73c