Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0c6f142a4faac5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 04:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 270a257380caf096109f88d0de0fe265 SHA-1: 244b33eb3e95ab677a44d286b315530537a7420a SHA-256: dc0c6f142a4faac5c99f2eebf1ded33bcae3fbaa56ed351178f0eb5a37a1f4da
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. The presence of embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and likely contains further malicious content or redirection logic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://chcial.ru/uplcv?utm_term=android+phone+deleted+photos PDF link annotation
    • https://cuatudongsaigon.net/uploads/files/64835101518.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/wapawefewudinodare.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210913_170844.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/70215962846.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396b8ea1a1d---fujofasamanamibimorib.pdfIn PDF document text
    • http://mfahk.com/upload/files/vegulumebivilek.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/fuvuwesibep.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e737c1209---jexudumikikuzepupezaguni.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/zuginugo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf3f144a84---jenexanadikezokavobu.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/butupezamo.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/38334024866.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/47381374660.pdfIn PDF document text
    • https://topupdana.com/contents/files/67987530351.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/01c7f19d8effc1141db24303a789e1e8/48034489166.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/63382854833.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139b1a10e7fd---sesarepixixaron.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/tutowudekenavinivus.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16136face7db7b---nirigifafutolinitof.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/lafovujinetivusisinemug.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/8056b0bd339746c35e2c13047b6f221a/roforebajuzox.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/43700288920.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/76584388383.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/96381226047.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630475425.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/13526956276.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/65281998349.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_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 10308 bytes
SHA-256: d301e7287463eb159f16db4dac424718fdf3d1b4aad8770e63b6e6ff294742a0
font_02_sfnt_off0001071d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 17460 bytes
SHA-256: ba9154f92b1c74a3730537911ebff382592d798ff03de080694bf5de26c40eb5

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