Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a49fa072a3fc39…

MALICIOUS

PDF

91.9 KB Created: 2021-09-19 13:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 48eb4ddbaa7f6822f9898fad26879cf8 SHA-1: 7847b30f8e558d4c80b5a972a9ddccebc9d72b88 SHA-256: 19a49fa072a3fc39cbec3d51cc5a05b8bc03ed0db7bde809f6659d12b5a52e6f
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 compromised websites or disposable hosting, 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 0.9968

Heuristics 7

  • 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.
  • 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 https://laborke.ru/uplcv?utm_term=me+before+you+full+movie+movie123 PDF link annotation
    • https://kfmaccounting.com/webroot/img/content/files/rubowunavim.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/72499164036.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/gezotebubizovojawo.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/37961659567.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/20621072865.pdfIn PDF document text
    • http://sdes.in/uploads/82368555422.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/20dc68d2c4a3edddcf54abc064e4adb7/95044996987.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/67654824980.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/6268086112.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/jejodobijarakojelobul.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dd3dab140---rewolagakunez.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/80d0bf1af25545922b9e174ba86ed162/87353054093.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/4a59323c45a7d642f341d531f2b4a5a1/xiponuturafobuvezebadup.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/75951151698.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/linaba.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/78394705631.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/xedigijokijus.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/xomitufej.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/lerirur.pdfIn PDF document text
    • https://titishop.co/upload/files/67564531656.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/77207609987.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/60110119300.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/45127211307.pdfIn PDF document text
    • http://zae.me/datafiles/file/mivuf.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_off000104e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E5 10600 bytes
SHA-256: e8c6c17f26575cecc6d8f5139a0811c3557dedf681af660239c2f31dc210014f
font_01_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 17228 bytes
SHA-256: 4e6ecbe85584c859088a17af0dbe1657d4717df775a92ff022ea5f99052af11a
font_02_sfnt_off000149f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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