Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8d26c621ee01ac…

MALICIOUS

PDF

79.4 KB Created: 2021-10-24 05:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 45c1222c1d1c133dafe541ba56129e83 SHA-1: f018e830f42dc1bc2e1f5ab0a26b938ffaf8a069 SHA-256: 9c8d26c621ee01ac55bfef23abf85f2dfa82f501667c12d46c6af6f756da1f6e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=teaching+common+competencies+in+ict+syllabus PDF link annotation
    • http://fornacedelia.it/userfiles/files/kaguketisebevisexi.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/suriluvi.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/6e960a68b61ef064b8673da3b510ab3b/2325677928.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///98663598622.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/1954784501.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/24820190464.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/63010627359.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/jewuxaborumekanazofagumuj.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/e62836d3d9e21988feccfe5f997560a3.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/2708487633.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/93428722638.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/bepijapebodokaxowubur.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/41585548349.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/54313d48e8c77b4d9629a2f6264fb083/saxosag.pdfIn PDF document text
    • http://kohaz.hu/files/file/91553562198.pdfIn PDF document text
    • https://maria-galland.ru/files/file/72158316853.pdfIn PDF document text
    • https://shaksheer.com/app/webroot/upload/files/52753937056.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/jemivomaza.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/gugifigisidojuxez.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/5849a66854029d691f13cbe2ab69f442/gaxekiwaxevibokafupum.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/zomufeluzubulajafobise.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///dusaludelufipumufe.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/953389f1e59757d531ad38936d886513/63333869586.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_off0000d15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15A 17236 bytes
SHA-256: f273b983206fb1ed1782b9baa950549c274470f9bb57f0c446648a8ad8120aae
font_01_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 11036 bytes
SHA-256: 1beb4afcb8e62948297b88fb21b97999dc0393e50235f2a562f1222635b79ec3
font_02_sfnt_off000117d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1