Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3b5309e40db3ce…

MALICIOUS

PDF

73.6 KB Created: 2021-09-26 17:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e7f58c57bde726785e29f9a85a6ec9dd SHA-1: 52d208255de7c3513ad7e91328e4cf985f4af29c SHA-256: ed3b5309e40db3ce1e3df42343fc0889ed72bd5130a245769c437162a172200b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous embedded URLs, many associated with WordPress upload directories, strongly suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=android+schedule+sms PDF link annotation
    • https://linhquan-group.com/upload/ck/files/52918750817.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/67d8a028e8b979c4b2a8ff3c4be9fbc7/98631972606.pdfIn PDF document text
    • http://makaroma.fr/upload/file/jedegojevinopujorob.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16147eeb73a350---sureduzemanumisumitizepos.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/vuzogevokojalimedetelinud.pdfIn PDF document text
    • https://e-room.co/userfiles/file/97348969203.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614544530a2de---90606613238.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/63203228429.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/wekupujetijanebuzawowabu.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/82937365120.pdfIn PDF document text
    • http://thaide.org/userfiles/file/17305269326.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52097575721.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/76765420291.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/suxopawebenomolizawuvo.pdfIn PDF document text
    • http://jawarakreasi.com/file/499406061.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/20934962095.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/23584307486.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/46837019341.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/folefiwobogemupadu.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/sozarosumuguvazunu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vt29404hubafapfd1pihl326fu/busupowaduvibugovosife.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/dijapoginapuvavola.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/tivuvodesebusifono.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/fezerinomob.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_off0000b997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB997 10456 bytes
SHA-256: 81d867eafa0dd2e159aa91015f115e97696a7cf9e672423188da0f9036c1fd65
font_01_sfnt_off0000d119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 18512 bytes
SHA-256: e7abc50067e5899dd8bd3c595202f30f0d07d8f027e0f7572af7fd4f88892a57