Malicious PDF — malware analysis report

Static analysis result for SHA-256 b053e7a9a84ffa70…

MALICIOUS

PDF

91.5 KB Created: 2021-08-22 03:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b19422b9d9c64d967f955f3ff37a08de SHA-1: f41d020fa287ca1b77661fa397eb2d6fb266baea SHA-256: b053e7a9a84ffa707c55b7ddb796a09c3597abb7d00086797d84bee8c4db5712
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some of which are hosted on compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions, while the link farm serves to obscure the ultimate destination and potentially spread the malicious content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d29fdf30a5d18c2ddd9c5775446c0562/pakusipir.pdf In PDF document text
    • http://trinkhorn.org/userfiles/wofotopanuvobaxolumupezag.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/xelabobevaxifat.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/gamese.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/xisozepuzodidovutolokuk.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/75141105807.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210726023527.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/masetow.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e6ed6b72---23403097741.pdfIn PDF document text
    • https://songhong.info/userfiles/file/barulidorogizafosu.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/eab292fcd603b32228fd0926fd8fa65a/56235581849.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/97744723691.pdfIn PDF document text
    • http://sushi-belovo.ru/files/5241598280.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c644728dd0e---pemajokerogewimofid.pdfIn PDF document text
    • https://stvorki.ru/files/file/sewinatubijilovi.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/29443676718.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tmjk7ns0dfjg4177n0dlns750k/teroreregujutelo.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/21598018177.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084531415a6f---91364365403.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/maziwasekuxuropa.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/87159300675.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/57368746886.pdfIn PDF document text
    • http://didopack.com/files/setapal.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/naxerapevagis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ejercicios+complementarios+para+tercer+grado+de+primaria+bloque+2PDF 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_off0000fb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4F 18368 bytes
SHA-256: 22fe1477be36b86388ed774955967a77ab0ab80aeb62718e62007ebec1d53b15
font_01_sfnt_off000129e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FA 11476 bytes
SHA-256: 658c328ed3395695427354daaeb823249e167fb8db7aefb69328fb58f357d16c

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