Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d22afe4210e6627…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 22:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9fa349b8602fa62a88e96ed90933a495 SHA-1: 2ded84d2e18a7b40e8025184efae2d9b95b740ca SHA-256: 4d22afe4210e6627921a13b8d0983ec007a190298cddacd39d98c67aed4b0e2a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farms, many hosted on disposable domains or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://krisoc.ru/uplcv?utm_term=the+originals+download+toxicwap PDF link annotation
    • http://vhz.cz/user-files/86819236538.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c04b52160546363054f9b20a7d94f109/83118467955.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/duziliporonug.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/turaluxu.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/55524053925.pdfIn PDF document text
    • http://aurora-c.jp/files/files/77170892515.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613524aec1774---11028092748.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/zoniwebogoze.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/pajekivutifaleliwafeb.pdfIn PDF document text
    • http://edeins.com/userfiles/file/ravinuvevukixisowafaruf.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/52351063287.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/pojutugifefixu.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/32818675b5729cd3f013aeb189984ac0/12343373872.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/71115707425.pdfIn PDF document text
    • https://ms02bet.com/contents/files/kedujir.pdfIn PDF document text
    • https://digireg.lu/upload/lupolotuvijapile.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/lijukaler.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/58515677741.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/40376154876.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/dosivuwiwimir.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/romakiditifek.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/87339466528.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_off0000de8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8B 17272 bytes
SHA-256: 88b6c1fe631e4ce8f295860c9bee1e869095d76c10bd0054fb835664843d6cbb
font_01_sfnt_off00010be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE3 10944 bytes
SHA-256: 186fc3c55b49af3d9db9a08c2bdd2a6e071d3648894de6b87c995cd01225e14e
font_02_sfnt_off0001251c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1