Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9976963a56f8cc7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-26 17:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4eebe5f8838fd70ec05ddc08c9b23cb6 SHA-1: 9c74f8adff0735fdba4770519c461b1f341b2ea3 SHA-256: a9976963a56f8cc7bd1566f8b5dee3d57d6a14dcc9f2000076042f73881fba97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or link-farming attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/af5dc8d05bdfc0ebca153b2221e6838d/74978909909.pdf In PDF document text
    • http://agroanaliz.by/upload/editor/files/pisukobogan.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/39991992251.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffcda3460---26051284852.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/70382620197.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/70688155051.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///sopixi.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/zuvuduzaganu.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/64547910425.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/2625328507.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/gogafugibope.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/69915737368.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/gosititafelokazuxamesuz.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/69722029206.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/nazurukunur.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/70646845486.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/88914436224.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6334b31f6---patarafetulukatave.pdfIn PDF document text
    • https://kueapem.com/contents/files/jeseporunaxexejikukodi.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/97913956680.pdfIn PDF document text
    • http://www.moyekolodin.com/files/nitebofizezoleduzitevira.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/49888596871.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/ludom.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/lubuzevox.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/sumuguwurabodumej.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f6d50cadc8cb71d3b2c0c3fb5a5d8c69/22747607256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=video+to+mp3+converter+modPDF 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_off0000bf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF06 20600 bytes
SHA-256: 1920d07ebb821b8ca54bc0327106f73a4e7201290b6f6aa67cd31eda75264001
font_01_sfnt_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 10504 bytes
SHA-256: 0fd2eaacd2651faea06e933d56ae1f9703d545225dd92b170c5a85ecc0f8eeaa
font_03_sfnt_off0001233d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233D 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34

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