Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb0111b6deb1d3d…

MALICIOUS

PDF

89.1 KB Created: 2021-09-19 06:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89911101cf73aba5fc562cf45f176a8e SHA-1: d83753d68e0c6d4b9fa72a4d822b91105d0264f2 SHA-256: 2fb0111b6deb1d3d9fa9e5e9e12ca22bfe2586dec1cc5a20e53a25a3d82473c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to various websites. Several of these URLs point to compromised WordPress upload storage or other disposable hosting, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://medvor.ru/uplcv?utm_term=watch+logan+movie+free PDF link annotation
    • https://perfecthospital.org/FCKeditor/file/78866475104.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce22f057f6---womizinebaxopisigipepazof.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/91353868827.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/bebixob.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/851e532b363b89873de28ca6dbc8676c/69092718864.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/lezuwotobubebivegared.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/94935382717.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1630642580.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/rubafudalonexas.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/nc48shbugcfrpbch8d7non1ira/madokagemujumolevu.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/40495412443.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/172077219.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/63581016237.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/nasezegixow.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/robebipekexidininutigo.pdfIn PDF document text
    • http://boki.hu/editor_up/59346148372.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/kutojufobe.pdfIn PDF document text
    • http://iviltra.lt/images/files/77121340891.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/vidafativ.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/85de7aba75c36a8dd4f67c808b9bf9b6/73653039734.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/de648616c91c98bc1120de3c2c58e66c/fadiga.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109050633357430.pdfIn PDF document text
    • http://dalaichau.com/files/posiwigikofevugesizivube.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/pasodenubawoxurajanad.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/nofit.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/8712207172.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/19180994323.pdfIn 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://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_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 10672 bytes
SHA-256: ec16e333576c3ee2c06e5b13dbaec8581174d9bc85934d180f6f8f5649e20d03
font_01_sfnt_off00011192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A4 17596 bytes
SHA-256: 391f76801f63ba216423cba2a05def9566e0b401f2c08e9887fe72179215c677