Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74e7fe907fb3962…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 16:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f15c58b677506a03664f9b842d7306c SHA-1: 8dd787e0552edc19bee150fccc6de0eca6e9dceb SHA-256: e74e7fe907fb396228340aef3a93d5b5005a8bc4e32aa65d7e82e8a01beba9cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/65d75431e57847572501be0ba22f7132/37542266324.pdf In PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/26676109185.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/megubigemujoxalexiw.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/gagevimunozobat.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/9636089201.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/54736344208.pdfIn PDF document text
    • https://bfull.ru/uploads/files/35258158338.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/jokolujafunemexaza.pdfIn PDF document text
    • http://dkind.net/userData/board/file/jokunapesuboreredegizuk.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/86903427518.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/18463171725.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/60458699144.pdfIn PDF document text
    • http://ukrfirework.com/images/file/13208118279.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/56936267850.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/nilexilufunitozuve.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613349af25831---feful.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/lifopisamagunikogo.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/jasir.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408e6d1d357---84270214573.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/poxidujakefaxuwe.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/66711279530.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/mutovomeguvabozunomunoxam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=watch+swat+under+siege+full+moviePDF 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_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 17952 bytes
SHA-256: 14679f22f1ce6b99ac782edd65ccdfccd0b87ba078c527453c88dc1a5573f5bf
font_02_sfnt_off000123c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C7 11168 bytes
SHA-256: 453de94eb4e794fc7deea49177d0dee2d8acf3bf32d7720ed9142c3dc1e1cece