Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a1c594934cc44e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-19 00:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5f011909771ef22e9b43c41a21ab726 SHA-1: 7e3c9065e3fb42628943161e2008e6cddb359e95 SHA-256: 77a1c594934cc44e2e4370b560931021c3b98d24824732aa18e58d4150e2d015
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pametnidom.hr/pametne_kuce/userfiles/file/89019667434.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f789fa049f---47256030895.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/476ae18dbb8bf2054a15c026ee063221/menasujatigupoton.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16145709475058---jimavetebuvurelalefimirur.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/7365872454.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/29565653295.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/87509544080.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210914104337.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/xikavelozodojuwedo.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/lubosupobewijibux.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/72094127084.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109101649394046.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/46203686504.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/24721436028.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/18913372046.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/fevuzatakabolobenikitud.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/92381436785.pdfIn PDF document text
    • http://allasclub.com/campannas/file/59909369937.pdfIn PDF document text
    • http://sieuthibds.net/images/files/69399099686.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/59865511087.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/20594552997.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/86485117527.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/90406421983.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/zekotadusujisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=escape+the+underdark+pdfPDF 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_off0000c066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC066 10636 bytes
SHA-256: 0b6825442f0119e5ff79ab49ec6e21b96da8a44e93c5550d85d4adf08328d5c4
font_01_sfnt_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 17216 bytes
SHA-256: e9e259aeb5c89eec60bf8000711c88594c14b797bc9b615f18849411c5e4a1ff
font_02_sfnt_off000104ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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