Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3d1f7f5a43fa57…

MALICIOUS

PDF

84.6 KB Created: 2021-07-21 04:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 864ed6dc324fc8c7024ed014a0d61e84 SHA-1: 6c4cda0a18436653effb5b8885d7104308093ced SHA-256: 5f3d1f7f5a43fa579513a38f368936e15ed81fdd66e5d29e71c166ffc43690c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier also assigned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093f2fc22728---wupidadewikanedako.pdf In PDF document text
    • http://agrobud.net/uploaded/file/35697192375.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8afefeeaa3---83188025633.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1dec09e5e---vajof.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/zusatoxafatosusofurowisi.pdfIn PDF document text
    • http://fxmeat.com/upload/file/b108df3673163783d58c181a20191a63.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/28179863987.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbe75a6392---xubolireragisakazororun.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/jevumemagigak.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/47112913714.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc7d10d83---71086693942.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/2e457d8804b9850845500af1e3d4d6a3/degajojujotumuwebifo.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/84456137303.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/kumijiwefufit.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bs3i85h9mrp6phpargj1vnebl/89006424436.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/1366501588.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/28287540577.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/fubabejetapozemozuzasi.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/ritidulugagimofoxipe.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/qlgbj1bojbvuo8cublvm5l667r/69420633980.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/tapeminizigebuzolo.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/tidufotujibetosuzivef.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/sulatezibabejotor.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/mebonogupabeniwoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=human+figure+step+by+stepPDF 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_off0000e8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 16632 bytes
SHA-256: d5fb0344563cd47ad66ea5ec4fdf4826944ac466c7d81dbaa264f784c80150c6
font_01_sfnt_off0001142c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C43 10880 bytes
SHA-256: 80ba129f49bb647aca15ae49d45ee4d8d8625f46490a117161a2dc126b1bb751