Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc812141b863e7d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 20:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b944e04b3b456e4d9e2a7f407e73456 SHA-1: b5f2dfa9a68894d045e8668b0a13d4e86c20d7cb SHA-256: dfc812141b863e7d474f4cbc948bcaae058797dd2d3e7120683fc657533f09e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=words+with+q+and+i PDF link annotation
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/rosorotifalefowov.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/rixadomesixafugumusepada.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc380240e9---lobojanaxone.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202196163463374.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/79540567894.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/nedafowep.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136249e4f13c---gevetiwetumeb.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/79587202427.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/33841174983.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/19301711637.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/sexuvozojomoj.pdfIn PDF document text
    • https://cncunse.com/d/files/xolabizi.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/fc8ad96f3ef7c9c49c9ee4c106b678a6/wesavuxu.pdfIn PDF document text
    • https://raljob.com/userfiles/file/73566292096.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/totisifujixanizu.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/sopojumiw.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/sipifelonerij.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/32968447587.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/dojibu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f23aaf34---28613643684.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/nudesatepukikivakawer.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/61325876296.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/12326077659.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_off0000d633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 10392 bytes
SHA-256: b9756d319ffd63e5e61565a58176db514efbb4d57dc097033fb80f4f15b273a0
font_01_sfnt_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 18692 bytes
SHA-256: c30b5db340265185bee85a09b115dc3c370eb4d7ede1b412609f528ceb7d9fc6
font_02_sfnt_off00011d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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