Malicious PDF — malware analysis report

Static analysis result for SHA-256 a040fd3c7a07bf58…

MALICIOUS

PDF

78.2 KB Created: 2021-09-23 00:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af05346429f0474faae026b406acb39e SHA-1: a7846bf122429478aaa7763620dc4ba56b30f2bb SHA-256: a040fd3c7a07bf5861b4f2af46eea17a64778cea32b2326e547b9d53c2d5f93a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple PDF files in URLs suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://onfireinteriors.com/userfiles/57895504591.pdf In PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/81713078008.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/22742528485.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/kupol.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/xekoxezeguz.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/dusipobin.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327de4480d6---98078444041.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5081fbdb---85126107536.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/41733896835.pdfIn PDF document text
    • https://kueapem.com/contents/files/94090491783.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/vodera.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/wirafewitejitapuzude.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/tisalugajupuwi.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/72764989221.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/45576468851.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/17626865941.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/31549660781.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/17925437432.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/88667923061.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/96620924268.pdfIn PDF document text
    • https://gdwtechnology.com/fckeditor/file/In PDF document text
    • http://rasciindia.com/firetech/ckupload/files/4946059353.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161333051860e9---wawetupuzefufaleke.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/37065148930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+dos+games+for+androidPDF link annotation
    • 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_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 17952 bytes
SHA-256: 01b4594b1235f9b38b0e367663ab6b963a4ccfc981d520736ce602df8b9525cc
font_01_sfnt_off0000fac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E0 10688 bytes
SHA-256: 6cca301106dc68b9a7435d772c06a42ddec34a513d66b308d9d9a7f1d0dc056c

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