Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe59a3c6ec07897d…

MALICIOUS

PDF

95.9 KB Created: 2021-09-06 23:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 34fefc34c0c51400e2dd2ca2be69353a SHA-1: bd3f8ebd8f9ff38ad746cb7715303fcaa811d4cf SHA-256: fe59a3c6ec07897dd5476bf73a4f3c8e374afff25b3b2ffa5cff4843015e433f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the redirection of users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://oniceh.ru/uplcv?utm_term=skewness+and+kurtosis+formula+pdf PDF link annotation
    • https://bulgariapools.com/contents/files/25055952418.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf927144c61---45505407739.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/fiwamoxajadib.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086202566a19---xotakajivuxopupoxon.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/23148317355.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/futivugolotewasawejuzelif.pdfIn PDF document text
    • https://rinducm1.com/contents//files/vamaziremime.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/40498005740.pdfIn PDF document text
    • http://wittzumstegfamilyreunion.com/clients/e/e5/e56c03c63d8c9260b12fda9e5e6a3df6/File/jejexawoxavibok.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/86412493329.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083678d03c7f---gakijozexamarubarizesam.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/refenikofasexuxapov.pdfIn PDF document text
    • http://nakatka.com/files/file/jonokowewapolagaruzebosa.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/45acc0af76eaa24f28c15e906d20513f/7937551732.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d617934b01---21687638232.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/febubelati.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160805a0375f09---karalujeg.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/gosegomuxifigeveseg.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5622780cd36b89d2b38043440c73ef2d/vekiwupowifo.pdfIn PDF document text
    • https://rosycaffe.com/file/81757627221.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d8c7f3744---lajuforopogi.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_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 21304 bytes
SHA-256: e4bd02e10ba3e1b58e4ada3af13e2c4a9509a0e99d43bd2ecdf61b359c3c1b83
font_01_sfnt_off00014012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14012 11012 bytes
SHA-256: 3d9c069861c5bd30ab35f5e123ef3eb6d107c0cc37edb93a1cdad65eec42c5d8
font_02_sfnt_off000159bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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