Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2fae35a2ba2799…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 10:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2e75564ac1e1252653f12c98dffafc70 SHA-1: 21293a736d82015bdfff8aaf47ce9f511322d798 SHA-256: 4f2fae35a2ba27996c38ff3844a5e239287b1007c4b783f205beba6f194d7f12
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=shadow+fight+2+hack+tool+download PDF link annotation
    • https://ud-hobby.com/images/Upload/file/xogabakevizusixu.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/72154354971.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/dimepele.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/29837342092.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/28200323519.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/vumutuluxodipavusaluxu.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16133624b4eb12---70213711885.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/movinimisiw.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/pq9b4tbsruc1cbl04uvasra8c0/rajilesigolibezonufaxifet.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d7a69d8f632ccd6bd6c9778a244d2511/gemosogeke.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/fuzerazuduxedipepo.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/lukowalumuninowetifuluja.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/bovalovowejubetelufe.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/74073706345.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/3562355207.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/xejolebebigajetasog.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/sezomofad.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7210928a0355ac7864bb7264a26451cf/jutov.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210904/file/16306885315582.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/titasag.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/nisedukenepifowa.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613977a246409---nakuwesusasubanoxopi.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/kirafuno.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/tegokera.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/96577337441.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/nibadajojufa.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_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 10728 bytes
SHA-256: 9151dea94fc346632f3c68f22afe3fa390acc7590478149a635cf3d110639b79
font_02_sfnt_off000118f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F4 18192 bytes
SHA-256: 7c94a710fb3207a7b676b8b48c7790e30d92ad927971f88937c348e7f416cdd6

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