Malicious PDF — malware analysis report

Static analysis result for SHA-256 897e14b46f425c7a…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 10:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c1d3477c581040d5e4ab0819e2a47df SHA-1: 7901b134e0b682458f5ca9e615d2473f37a0089d SHA-256: 897e14b46f425c7abdde0984b7e6eae3d915acb61b2bd521fb7fe96dc8d30a45
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple links to external URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to one of the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://capitaloffice.pl/fotki/file/30188294098.pdf In PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140cbf23cf1f---10228773577.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147177e81dd1---tixifejatifimisivi.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/76225811908.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/27684767992.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/fixadimosibamasunewareb.pdfIn PDF document text
    • https://shreeaksharinternational.com/webroot/img/userfiles/files/xofafidetufuliboza.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/25767599302.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/morogosenifonedax.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/11443790028.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/56495266197.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/dilat.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/17598710531.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/49409172297.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf1b2fabe---bufejuz.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/xanafemipoputixirel.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/juteredin.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/xijebojugidagoned.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613391bdabc8e---xekefetoponaruwovub.pdfIn PDF document text
    • http://mutitar.com/user_img/files/18188029619.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/dinufoselur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+set+up+voice+message+on+android+phonePDF 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_off0000adfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFD 16056 bytes
SHA-256: cad998e8ebc3fe75b0fdce1481049e7d42ea53c6db293c51d82032ca8c2269be
font_01_sfnt_off0000d659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD659 11160 bytes
SHA-256: c17746ba689adec6f232a81b05614a3541d9f7a1566d1dafda44d4c90579911a
font_02_sfnt_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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