Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f59c0d6501d81bc…

MALICIOUS

PDF

77.1 KB Created: 2021-10-01 15:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fc5ea7c66cf5e5fbff7b661714a71fb5 SHA-1: 897ad84d31953bd8722c96421aa9c18f80191727 SHA-256: 8f59c0d6501d81bcd254f3d73456f3a040a62129da59f4187a2adeef0834504b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 http://tuyothuyluc.vn/webroot/img/files/zavagerinap.pdf In PDF document text
    • http://ausietech.com/images/file/23730191174.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/gikazewudebivufulijedo.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/xorerewizazegewajuteja.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a60b18a54d45eb987cb3e8c8250772e7/zetomegesojukidobuzuzilat.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/36731607233.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/diwoboladavuzekojufusus.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/kiderenoxik.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/zemapigidamav.pdfIn PDF document text
    • https://anvatsaigon.suzukihungyen.net/data/dulieu/files/jepibufirirewuz.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/tutebufibiziletenovavitaj.pdfIn PDF document text
    • https://mimpidia.com/contents/files/godomolabarev.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/26246865575.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/fasasev.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210912045220905389mzwst.pdfIn PDF document text
    • https://media-get.com/userfiles/files/mosamagupumuzug.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614af4946375d---15341408791.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/7008563991.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/55349142512.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/58569378063.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/gakexuxamidemuwolobexoni.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/86169604482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=black+ops+ascension+easter+eggPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2f69d0f8d55e208b4408b026a6a92c67/70870696944.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_off0000c1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C2 20256 bytes
SHA-256: c3246ee69469a8e331227e30860595844acb4230c3c43a79706426275ad141e8
font_01_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 10696 bytes
SHA-256: 49c74e19f407514cec5bbc9896f57adbf22496b8b979ff19ed1e4e0a7f956afc
font_02_sfnt_off00010f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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