Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70d6c158ca6ba7e…

MALICIOUS

PDF

85.7 KB Created: 2021-09-24 00:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5cba167019e1c1e6263d158b7544e115 SHA-1: 96583077cdca2d5a3b338babdf0dba0d5de8cf42 SHA-256: e70d6c158ca6ba7e6b130d4cdd125f75d1d480ae2faa7cc7104d1316d66ef76e
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://truongthanhco.vn/webroot/img/files/tadujipitek.pdf In PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/75244963912.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/rizibomidan.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/gimetaxopox.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/62180434623.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/welivitotapimabaderan.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/77785067535.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/gigobevidagexarapa.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/pomanirafipowakulenulo.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/99461900442.pdfIn PDF document text
    • http://aimic.com/userfiles/file/wikosezobeveregaje.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7a3b03b8f---durexanak.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/fumagusefetuba.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53573058199.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/82492312508.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca02e889e---1564531982.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/20447880264.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b519f62c9c---duzefivepalavuviwipekida.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/52373005615.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/83711040316.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/wupexojinodaxelazew.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/rakira.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/tuvugoziriludikaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=anime+gogo+primePDF 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_off0000e829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE829 19136 bytes
SHA-256: 641cdc8912be0ad73a7d9d33a39f98c903249794478b09b1f1915d0ee9a2019c
font_01_sfnt_off00011ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 10100 bytes
SHA-256: 46cf7ffeab72be2568c9e69fd1a5d8e7715d389826d2e06e173f4fb0869311e5
font_02_sfnt_off0001311f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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