Malicious PDF — malware analysis report

Static analysis result for SHA-256 92590ab1ca7a245d…

MALICIOUS

PDF

75.5 KB Created: 2021-09-09 05:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc6e6afd97ae6b70038bd1f44e04b899 SHA-1: bbc5709860dba67ab597ca4f87931ed22d404d86 SHA-256: 92590ab1ca7a245d2770d03af76748eec95d3c64663a83c43955e096e44967cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous URLs, many of which point to compromised websites or are part of a link farm. The presence of embedded JavaScript suggests potential for further malicious actions, such as downloading additional payloads or exploiting vulnerabilities. The link farm structure indicates an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://infrive.ru/uplcv?utm_term=best+sudoku+app+android+no+ads PDF link annotation
    • https://er-cardiff.com/eurostyl/photos/file/52167401141.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/52142882074.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/39282689061.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/53288049608.pdfIn PDF document text
    • https://majubesar.org/contents/files/zupubozupupodewerutedediz.pdfIn PDF document text
    • http://villkasz.hu/editor_up/19565115470.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/zovefewemimo.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/28149383834.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16136e360bbe8a---12432262459.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/zoduvupesoxoxexa.pdfIn PDF document text
    • https://mahae.hu/files/files/jorinokabafaderi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rujegupefover.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/11051834527.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/mekimakevomemagopalu.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/82990064212.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/vuletepodusojezimikivi.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2f5acd848cadafbb0d01c84851e5ede3/13179270164.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/48592886367.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/wikoxe.pdfIn PDF document text
    • http://hijoin.hu/editor_up/fibobamaporozowe.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/wudatoke.pdfIn PDF document text
    • https://rintrans.com/files/pigitewowuk.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613442a8ee5ea---51382220627.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e4a6d8fecc371cf43a755f92a7bc773e/91047235431.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/53205641132.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/32612710720.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_off0000c3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DA 17024 bytes
SHA-256: 8a63ec422ee3f1d06ee8013641ba3125799cda7e878fa00a282829f20daf702f
font_01_sfnt_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 10584 bytes
SHA-256: 426649f4f42a6dc4d7ab466b94613c8ed286db4e7a849612f77202cd27f89620
font_02_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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