Malicious PDF — malware analysis report

Static analysis result for SHA-256 4615d764a3a8597a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 14:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a27616959374b5d371f9d94ef093b11b SHA-1: 8a20f538c306c461e489836b9c5ed12fe82c411a SHA-256: 4615d764a3a8597a49d4ce1520a7cbbd266926ab5f36dfa677b89964a982420a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=which+are+the+most+populous+countries+in+the+world PDF link annotation
    • http://cokhitienvuong.com/uploads/files/vizuv.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/wikugabebamakaziludam.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7d89bb97d---fuwizejabumitejavixegi.pdfIn PDF document text
    • http://technocom.pl/editor/file/55439112931.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/ninigugurisobiwetosalex.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143b6a6c11d8---15333621791.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b702e12eff---kesuzuwisekog.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/vemukaxakepuzanisavila.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/gojipu.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a324b094681a7354b567aa7bfedc33d/mibapazemosibisus.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/r95q406n14hmid3opmqd8nv5q3/83095540535.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/degoxoxirunokepi.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/tikatipipijitavotijapir.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/xaxenumo.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/nerosatozetadolakababizox.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267ae277bd---sojof.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/6931266dcb53ff64cd563fd57941a27f/mufitenerizarava.pdfIn PDF document text
    • http://wohntraumgmbh.at/wogaxetako.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/migobulupigiseluwanujuj.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/53459538424.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/zobototuva.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/sinejom.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/jogidubanudedikajedozuw.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_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 10956 bytes
SHA-256: b83bf4c0e87c5520c124ab37a40dbd9a7149c62ca1aa3ddc8414ef0c60864766
font_02_sfnt_off00010d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 17780 bytes
SHA-256: 6f81f4c7bbd75b539b0c0d5ac0b0e92853fecede8b77dadfe7cc4a0dbfeb4963

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