Malicious PDF — malware analysis report

Static analysis result for SHA-256 090b5b04cbaf3248…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 22:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72eb0a25fd36b0f79931929589ea100d SHA-1: dd37332612ef6086cbf9e93ac68021f49ec4e906 SHA-256: 090b5b04cbaf3248fff383b51f6ab517f690c95cf49dfb425431072818301c30
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to compromised websites or phishing pages. The presence of multiple links to compromised CMS upload storage further supports this. No scripts were extracted, but the overall structure points to a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://inwebjor.ru/uplcv?utm_term=level+165+candy+crush+saga
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb883edc6---37843851989.pdf
    • https://aiwcecckolkata.org/FCKeditor/file/mowexize.pdf
    • http://ghalemdi.com/userfiles/file/dakozenetageruwibozabol.pdf
    • https://wfca-czech.cz/temp/userfiles/files/92150693322.pdf
    • https://camelcarpet.org/d/files/20513397384.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/drukk19br1s01tjd61ec2rg5o0/62365080910.pdf
    • https://eco-translation.ca/upload/editor/file/43484405361.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3c7d038bc---13524871418.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f3e564fb9---jeloxujuwokekumidepim.pdf
    • http://cpghollywood.com/userfiles/files/91749135305.pdf
    • http://trust-law-firm.com/userfiles/file/20210902085728_1384106192.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161368443d979c---tekifurofixidado.pdf
    • http://jatyn.cn/upfiles/202109/file/1631146478.pdf
    • http://villaelen.it/userfiles/files/ripefafipitow.pdf
    • http://etcad.net/np/upfile/file/banotuxep.pdf
    • http://hotelalbicia.com/userfiles/file/35326250961.pdf
    • http://elementyzlaczne.pl/media/file/lesasakawe.pdf
    • https://kenkochaya.com/user_data/ckfinder/files/13200832151.pdf
    • http://officegate.biz/admin/fck_upload/file/muriwipewavoxoxinijixo.pdf
    • http://nwatchonline.net/userfiles/file/19562748629.pdf
    • https://asmitahrgroup.com/ckfinder/userfiles/files/raguxibujifiwi.pdf
    • http://gaongonmaiphuong.vn/webroot/img/files/vemurejexinasapugunug.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0e2289a6004488479027f33678df42eb/87285992220.pdf
    • http://hondatayho.vn/images/ckeditor/files/89924928815.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d797.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 16792 bytes
font_01_sfnt_off0000efae.bin
42edbe9658c48ada36b946ddd8d86fcdf3a4fb835e3615626bd75d1843b6efe4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 10928 bytes
font_02_sfnt_off000108de.bin
dba41c02298a40163cb691ae6c9cf31c91b62cf850a3e77f58c627ffedfbfe2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 17416 bytes