Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ac862d32a5768e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 08:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d528894bb90e4042a55818a77fab6a22 SHA-1: 5a9230d6c0a822aa631de87467a372d52701981b SHA-256: 84ac862d32a5768e6b8396f0b70f5c196542fce451c4e8d37e085ea2e5234cfc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URLs, many hosted on compromised CMS upload directories or disposable hosting, strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm the malicious nature of the file, indicating it likely attempts to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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=indion+850+resin PDF link annotation
    • http://sk-uralstroy.ru/uploads/files/5649377336.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/65603259943.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b75fdd69b---paxeritexanimoxesajuva.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de692b7384c---56832840256.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/vaxuvop.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/sodejipimagabufunipog.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/laxejewepadanujado.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/19963719663.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bdc35624f02f481489ea75d06080fdd3/40785669336.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/82671232814.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/c42f6574b2fc64f4c079e2d828c1b2eb/podixunotodamenuwosuxo.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/mivuwojuzexewexe.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/65250963504.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/kakajiloporovusare.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9a05bcc695---sirexi.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/fetezagujom.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202108170852324332.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/fixowekirominepurojirowe.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/nozorirojifuxusuwegubojof.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/latuwofizanupisinaline.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/58908648677.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///6021899477.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/59342541402.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095aaef47693---jokiraradonamerikipi.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160861df824d91---wekotub.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2b6c09830---15740909164.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_off0000e493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 10348 bytes
SHA-256: 9c476aea46b3fd67e81ba60f1bd98ea484631b14556d77167d7b794c3a197b4a
font_02_sfnt_off0001141d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 19172 bytes
SHA-256: e5c7c926d338be27e35bf35a419808720754fafc41073ab647b2a201c68d93dc

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