Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8616a20ff1cb7c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 00:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d6d7236ce5572527f335d27df82b2d58 SHA-1: 8720999bd92c6a94714eafa10a68f64fd183eeae SHA-256: 2d8616a20ff1cb7c942c638ca012324f6991b151b3cfb12e52509523d54386be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs that form a link farm, with several pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these redirects. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://autowagon.it/userfiles/files/babuwimaratukof.pdf In PDF document text
    • http://alt-1c.ru/userfiles/file/68750548274.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399492c7669---xaxikenu.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/76339868305.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/16502770869.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/ragamixivepeziwutexu.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/balurixesepolajazap.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///butaxegatamok.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/94582282281.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/11041645796.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/lovixu.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/9922930897.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/favemufivuxugediji.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/disafopisofubekigikaduwa.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///lajekodekuxosizekep.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/35914298715.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d22516708a5199be0008358ab567d23f/58771193904.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/46625111818.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/vedazibuxomugul.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/giwekowiretotalefifebi.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55305688260.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ufum4281dv7rub2mdgvaqufrnc/mixitox.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///7719581548.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/10996234016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=polaris+apk+downloadPDF 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_off0000d432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD432 18472 bytes
SHA-256: 380f2eae27f5a7eff81479891ad46740950107f95aabf8321a388182c7a7134c
font_01_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 10336 bytes
SHA-256: 4b5085caee79a8afcb5a74da268444fafeb848b95d1c88e21cb9b24793b9a8a8
font_02_sfnt_off00011b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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