Malicious PDF — malware analysis report

Static analysis result for SHA-256 683d6acb1433f345…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 13:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e993e1cff95726872e38e9c41eb538e SHA-1: 016c14038056439ac93e22e3ad91d8c7b15650ba SHA-256: 683d6acb1433f3453616ea5e85e56757a354831947dc4b06cd9136a0eb85d8f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external links, many pointing to disposable hosting or compromised CMS uploads, strongly suggests a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://amrapalispot.com/userfiles/file/fafagapirawopiji.pdf In PDF document text
    • http://studioassociatoemc.com/userfiles/files/rudomagutefa.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae134ef111---fomiviveramogofa.pdfIn PDF document text
    • https://arerp.kr/data/file///dawaxuduxezojigawabap.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/74636922370.pdfIn PDF document text
    • http://orlickachata.cz/files/files/58181355383.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/dc5318f0020f39bb96ac3f6d36128501/rajemigadijozujezebi.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/fanozedosadurunaronesaw.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/34300727112.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/foror.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/57179209343.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/7809538409.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc1fa3c6a---92758008512.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/miwevevabidasosopakibis.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/pabufukipaninezoxaz.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109090747453218.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/rogokarerokadasumula.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137549f144ef---nibize.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/natimiluf.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/67574784546.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/fiwosuwe.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/zaxados.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303ec65e323---28150351009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+dead+trigger+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_off0000c061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC061 18788 bytes
SHA-256: c2ce78aa10a9ab2cb29717d6b18b40f214e6d6431192cf61b05c0562d3760dad
font_01_sfnt_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 10460 bytes
SHA-256: 8013d4e92871bd2cc3f1675010c2a76460ed046384196763d5bcaeea9417d054

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