Malicious PDF — malware analysis report

Static analysis result for SHA-256 a039aaa4877cec4d…

MALICIOUS

PDF

90.2 KB Created: 2021-09-19 08:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bbf9790bacb6bee47af39b1a0b629ceb SHA-1: 967be61e8c219813fbd0c43ebc3165eac3320535 SHA-256: a039aaa4877cec4d0e74b9df732533e49d0a64955b11ff5d8f6d0d6bed2e7c38
204 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, including those pointing to compromised CMS uploads and disposable hosting, suggests a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=different+lightsaber+styles PDF link annotation
    • https://alkirbilaw.com/userfiles/files/46920596561.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/sanirelufitepujoba.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/65570376899.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/14703880320.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/zekejutefu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132702db6f21---12819245659.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/bufowurilet.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/kusizapunabudelerateki.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/81255488877.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/13597514779.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/43875005551.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/desugadefinanawiwu.pdfIn PDF document text
    • http://stefani.cz/fck/file/54181727682.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jonewar.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/padibuxipu.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/54979694678.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e2be196da58b784ef80d581ff4f62c79/golimesupod.pdfIn PDF document text
    • http://crm333.com/documentos/file/tajigefomasujulikig.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/sanexofixevatumu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161468a16a4755---48628731259.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/92fe0aed27d6cf5762d3ce756d023bc4/53301222057.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/lowevopinijafezo.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/puladunuke.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_off0000fbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBA 10628 bytes
SHA-256: d2647f70bc37e48e68c862e6a63af25b7367b101ab8b07c98b5c2146b2f4ffaa
font_01_sfnt_off00011408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1A 18044 bytes
SHA-256: 516dadef741bf89b77729126de4f34f9e22816cd40f094277ead1cde9f2a0f60

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