Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9debaae2eecf546…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 01:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 15009dd42fe2a4111a2e51e129adb69d SHA-1: 884d59b87914124a4d80473640349138751bbd98 SHA-256: f9debaae2eecf546bd4bcba6d0f47c6de4d3da46b19bd410cb0bfff5f7534165
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and disposable domains. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=pubg+mobile+lite+new+update+play+store PDF link annotation
    • http://jedzenie365.pl/ckfinder/userfiles/files/tokisobalixuto.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/53587741412.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/52195367141.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/85446458571.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/lenolufuvo.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/motofetinosukavupugowuvo.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/52046692052.pdfIn PDF document text
    • https://angkalaris.com/contents/files/67295722874.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/17646803606.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/guvukafisuwakaruroworuxan.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/risawirij.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/jaduvasudesikexaxawebipi.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/bemanugijorekokuzowu.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/15200267943.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/runilum.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/89accbbf9a5b6f94c366afa532cd6f0d/veketix.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///kigusido.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/11f4da05ebe5f6bec9c8e996d9ef6181/84240945566.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/fogevoler.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/69851902622.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab56679358---4771050711.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/33794108362.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/sitarisewaribupedimu.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_off0000c0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E5 17040 bytes
SHA-256: 55179a695bfbbaa7f46690a312674a48854c3e4a5c833c581a4310679a9565e0
font_01_sfnt_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104ED 11176 bytes
SHA-256: 950bde0ad1b2ef996b565b6993427a595546bb5640fbd974754be79990f2e348