Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf0e796b40ed496…

MALICIOUS

PDF

81.2 KB Created: 2021-09-27 10:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ac555959da3ce561b66a30e6a7c83844 SHA-1: 1265711ce2b24241c23e438f0a5666d9546fd25b SHA-256: abf0e796b40ed49610ff4d2e3b608a33592abe41c8640877f0d82291db5bb229
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, as indicated by the PDF_JS heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=photoshop+cc+2020+crack+torrent PDF link annotation
    • https://cmottaviproductive.it/uploads/file/33827970914.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161483ea8d48d6---30954452095.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613739b855b29---jivozilovebilipu.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614db4a410ede---gatamodona.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/60559887289.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/77138767732.pdfIn PDF document text
    • http://baove24h.org/upload/files/83042629110.pdfIn PDF document text
    • http://sireny.net/share/files/temamamalelewejipegawa.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/koxelokunu.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/kodativesixesa.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/gojidemalufune.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/bumamugejiluxugijudonamat.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/27085662260.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/jegapasezidi.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/78837046654.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/10260949096.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/nipako.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/merexuzupegodikitajix.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/23972795548.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/rikir.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/67681133680.pdfIn PDF document text
    • http://goref.ru/files/file/powuvegexonusesevadon.pdfIn PDF document text
    • https://777mto.org/contents/files/vutiwirusi.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/56032327010.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/vabijibegejadu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB637 16704 bytes
SHA-256: 59c413e9e0f4f9bff263455b84a658af2419eb68a7d4a34ab7593b557eda66ea
font_01_sfnt_off0000ce0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 10668 bytes
SHA-256: c878e5aa807243bddd3116b66e49154c665ca8c3d07e33bca9dc6c543f9d80b5
font_03_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 21048 bytes
SHA-256: fb7afae4e563c5c982c27e72c9e327c837848ad810c5a5fb6754cc4e5291bf79

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