Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6c9212590a89b3…

MALICIOUS

PDF

88.9 KB Created: 2021-09-13 23:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f59e2a9b513663d1b5491fe8ab881386 SHA-1: 5a3b45ac6c9b49ea0bb0f0dc669f27408af5128b SHA-256: 3d6c9212590a89b3408fdacc0c09e04425f95e771a0886bb395c682714e3f138
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://catamma.ru/uplcv?utm_term=short+and+long+oo+sound PDF link annotation
    • http://nguoigiupviec99.com/webroot/img/files/zuluvubevenegonirox.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/fidanigufakojanaxem.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/97432647013.pdfIn PDF document text
    • http://ux-school.ru/files/files/42179242190.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161393d5aee8d8---50850804911.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/35799910050.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/pixuvamoxamodumanipa.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/peramizuxojadotobemiroro.pdfIn PDF document text
    • https://isleo.com/i_photos/file/393146512.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/dawupoj.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/97298144338.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/zosevivow.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/29912553116.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/46807198680.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/62746806382.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/06284e4b7c283b15827e02b4c46a03e2/vawakozoweziwomimexe.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/63997637171.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/kubiridunuvedixidililapaz.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/jenunelibotamebivog.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/nevibikapukotiru.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-1/20210901135807912085.pdfIn PDF document text
    • http://moneymaker-gold.de/files/20954244268.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/de452e5aa57f17b9c01b336c28d7d0e4/1949614138.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/79525788233.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/lepamod.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/22385299265.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_02_sfnt_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 10480 bytes
SHA-256: b398c192dd05cf7409296cde266ea230c9afbf9edb05937be5e20ee012d510d8
font_03_sfnt_off00011d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D40 22384 bytes
SHA-256: 2cb7604740bcdca39d4bc8bd3123c605b815a2da0e5e45edc5527fded4030346

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