Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c70a426eaa4e14…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 23:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ac4f4386c2aaa4494a5c737b92a2974 SHA-1: ec36bb844ea9c2ddfbfe0d98804ce84ebc91785d SHA-256: b8c70a426eaa4e14065de691e7a924ebabaf3371ab692f8c21c02ba500e4c3dd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=apk+mod+among+us+impostor PDF link annotation
    • http://ildungrice.com/fileupload/fckeditor/file/7304388279.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142106c5ef0e---94811909696.pdfIn PDF document text
    • http://soles2walk.cz/data/file/vupoxileza.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/60166466992.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210905105832_3dby2l.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/janupujixetazigerosoz.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/74334094125.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/dudufezisise.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/89753634164.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e847b1d9e2ccdad0841a47681217b497/10704452759.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/13922132990.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/16801626925.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/1umieojs7jhvhpgn19ch6iioh3/74154974721.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/gosokuxuvenosiwugelidaza.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/puzufadebopetipizu.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/pigib.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/jobejukapawudinemilus.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/99738473148.pdfIn PDF document text
    • http://husplaza.hu/editor_up/dilemadenobusav.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/91076431652.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/75695556544.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/43630093906.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/67206061437.pdfIn PDF document text
    • https://iohrp.org/f_files/files/18232671548.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_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 17404 bytes
SHA-256: 542dde0ccd3bde6ec877e7eedf2418e07b8286d5ba04aacf846c0a9f9b0f6630
font_01_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 10732 bytes
SHA-256: 90810c36f5cbf0d2c41c939bff6aa97dafd12929ca6b20ebb023a64b2acb966d