Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba656b0c14a6575…

MALICIOUS

PDF

73.7 KB Created: 2021-09-26 18:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d46abb0aed54d90098385ac385faf4f SHA-1: d796e290069045042324e7bcb4453fab0631a123 SHA-256: 9ba656b0c14a6575fdcece2b3c7161a63b4918247a6feb7fc3ed02e662934b2c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JS likely responsible for initiating the malicious chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://lube-stc.com/ckfinder/userfiles/files/vevinatujawexit.pdf In PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/xewumosemovivigux.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6a6d68a28b7897df14870c6e774eafd1/27113673477.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/94524262375.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/kezime.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/selubasibukuparoduzema.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/m5en438u1ujvfpc7452umjt7pf4ko8j3/negilefojitatepij.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631199599.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/53783373586.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/nlooar0qu37koof087n4tuia3c/lodudipidiwodazopaweto.pdfIn PDF document text
    • http://petrduchek.com/files/66469436739.pdfIn PDF document text
    • https://zagi.hr/files/29250012207.pdfIn PDF document text
    • http://xn--80aer5aza.xn--7-4tbj3b.xn--p1ai/ckfinder/userfiles/files/zidiredekekovopo.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/wotedixig.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/ganotorumelibaxem.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/vabipowidizak.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/femagitinijasinavenizot.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/37210002255.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/151239418785.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fc75532170d8cf081fe8fa7a5fa188ed/warakazife.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161351faa52286---kegezavokovud.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/gizemofarakujekajarugod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fake+gps+location+ml+apkPDF 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_off0000b7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC4 18660 bytes
SHA-256: 15e33f47ae89158127678579cf187cf63eab018eca6275c720880306fd2824fd
font_02_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 10688 bytes
SHA-256: 1f51552aca312abd311dc4453fa589eaccf1db0a331d92e3882f9d050b2c02c0

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