Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3416eca0099f153…

MALICIOUS

PDF

145.5 KB Created: 2021-09-15 13:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f567108647b8cbb01b62dd425ccfe022 SHA-1: 4567121d9fe496b76ebc2ee9833d675f17f75fd4 SHA-256: d3416eca0099f1531a189c67d884b0c51824588057b7232f50b8b8707f22be53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress upload directories or disposable hosting. These links form a link farm, suggesting an attempt to direct users to download further content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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://bipalisdemo.dashindonesia.com/userfiles/files/duludonewomix.pdf In PDF document text
    • http://techbis.pl/files/file/xiwajutojonopiruwijotiwum.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614189c69db01---74993260631.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/32345589659.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/dq51rjfnmi83gagrbeo97nqiat/28131622608.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/94553269304.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/sinogatisemidokasi.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/xufomab.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613749489b68c---68463136466.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-4/20210904023050919586.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/30161623659.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/8627255142.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109130849147561.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/somifawunar.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/bawusibovasazediwinuzak.pdfIn PDF document text
    • http://infosierra.es/images/editor/12425877831.pdfIn PDF document text
    • http://test-immo.com/file/69406020076.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1277288316532f9416d161c5fee797cc/1182896128.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/wusotalepamoxapajir.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/sotoviminemakire.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/47370564634.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/90880169575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pink+panther+game+download+for+pc+windows+7PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001dec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEC8 2244 bytes
SHA-256: dd5e200a12ac3f1614e7509565afa3a2dbb23637d1caee7d053548097e17398d
font_02_sfnt_off0001e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8D8 19872 bytes
SHA-256: aad6bc53fa6f857045c4606399c31987d084b7841b111ad65df179b266a09297
font_03_sfnt_off00021d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D21 11296 bytes
SHA-256: 2177470512e35dba2cd00d11f809e903c3a7966b11b1f1deb50f51d25dc14e8d

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