Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f62422feaec70d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 16:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9c65eafc84bddde0dbd2a19cc7ba20d SHA-1: d934c6b55a46401c221cc758e74cffd3dd7c0df6 SHA-256: 86f62422feaec70d3f6006a1df37324de374ab6f51940922745d39397fc2309b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/f2ea2645c2956793406be05772ae1dc5/daburotatakipojitatifesu.pdf In PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/wazaxasijiburonujez.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878d62725d9---gubinadipavuvakaxop.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/xunekuradajo.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/72093603950.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b898e879---sufojabu.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/99126002310.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/19155036318.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/vo8v9b2os5t10aadf8kdtnno6q/jabakozafalusilemafom.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/dulotudutozirixuwutif.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nakudenosazomafuwalunimep.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/61tmno6qenssgp6jn90orgf686/94945125305.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098505d8fcfa---vidonazix.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/fufonojuvarenopobi.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/53842893201.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071caca27117---fobipelosuxogo.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/xilovu.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c908471312---37775125230.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/13b6e88e0229da83663dba16d9856f19/koreluseganotur.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/dozamujo.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/lutiwizede.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099c82571724---72761228129.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/120212810.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/43597834559.pdfIn PDF document text
    • http://land89.com/ckupload/files/29169800018.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/77469265307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+make+glass+blocks+in+minecraft+survivalPDF 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_off0000d9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DA 11152 bytes
SHA-256: bb60601722c0e857c1450e6a527880055157c497b1f9a0a1c079443f056150e6
font_01_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 17124 bytes
SHA-256: a0d02b9f6d9bba1b018a0bb2fb207cde9de12160c2ce51ad2d8ae9296e8def36
font_02_sfnt_off00011fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.