Malicious PDF — malware analysis report

Static analysis result for SHA-256 26664db95ae5ea86…

MALICIOUS

PDF

68.6 KB Created: 2021-09-30 11:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1eeb901649ce92a0975079a3c1504b9 SHA-1: a6ceb302073cb4521fe541b40434604be0718aa2 SHA-256: 26664db95ae5ea865ea5b5a1c6d09b5c34d1b7e2a4f1db4917e6f177a5ac1695
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of embedded JavaScript points to potential exploitation or redirection capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://archism.ru/uplcv?utm_term=zelda+twilight+princess+hd+rom PDF link annotation
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/adae91tn2msohrgieaqn07k51s/29274511987.pdfIn PDF document text
    • http://namngonviet.com/user-/files/92210938737.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/73770867513.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/vnt84mhbpcrvn0uc3dlcpulaq9/xamiwubuximejubo.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/makujebogefoguti.pdfIn PDF document text
    • http://henca.com/files/details/file/moxukete.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/69163473011.pdfIn PDF document text
    • http://mopron.ru/upload/files/kunetuloxajawowelojunur.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614b620572620---65510148671.pdfIn PDF document text
    • https://wildnaturetravel.com/File/relifavesela.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/fugibujuzemogoxidojonar.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/19806319416.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497fa0dc268---sotaxekalademibozamotukaf.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/45421179689.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/79428529325.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/religivojaju.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6a84ba3e---14042452939.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/86181859958.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/27944700662.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/koviborevixesu.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_off0000ab3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34C 15260 bytes
SHA-256: 39b9383fe291029f0e1cf95bb01da5b21d25b9cf42e9f02527736330d58ce1be
font_02_sfnt_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 11008 bytes
SHA-256: 2f0132ab263fc585ee293ba5f0b9eb7de5113e8018c344a5b170b23840940c15