Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2084fbba2343bd1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-02 08:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e16b1fadfceb253903993023cdebd41a SHA-1: caa65fc36b126a4226041a487c80bf2c30c4c22b SHA-256: b2084fbba2343bd12d8c8499bd1645a8016e48443c0adcbd4eaf44808fd0711f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also features a link farm pointing to various compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the ultimate destination or distribute the malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://computer-rudolstadt.de/upload/file/73188673711.pdf In PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/sagolovutelug.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/n3j3c84m4ba20103e7ogb2gir5/17449672990.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/kuvotuvawekoz.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/jetbvounp4esja312cp6t5l6jv/xonobovozesovosakizakomal.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///nexokolonom.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/misipoxomibawadagekew.pdfIn PDF document text
    • http://indel.sk/userfiles/file/xamopokonebokolalumusimog.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/8639085393.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/24582825007.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/gezusapawuxa.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6f627634de2064a7057207aadf13ce6/29479653451.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1369d789501379a0526a0eb7378406ab/vatama.pdfIn PDF document text
    • http://topas.lt/userfiles/file/66727252417.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/71sqb4gf3i04ft016oe5p5r3t1/lomen.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/95983338735.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-08-16/images/files/bipojadatobaxalowedut.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/71855042036.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/72608832401.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/vesikisewejame.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f140852a301---62044099969.pdfIn PDF document text
    • https://egf.tw/test2/images/file/98073143038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+do+i+know+who+blocked+me+on+snapchatPDF 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_off0000d3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C6 10988 bytes
SHA-256: 2f6d988782c0fec895257432c18750981d4a1c7e9cfd02b0d26ee48462f10703
font_01_sfnt_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 17612 bytes
SHA-256: 88aa352581878d7ef6229b6d670a818f1161ee5faa21037cd2f385686beac143
font_02_sfnt_off00011a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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