Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0f9e7d2e7519e3…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 09:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71c4f0a46e1c854da32e33ff5ec799dd SHA-1: 1654810356efa52f5819039e13c33115e0a670e0 SHA-256: 8f0f9e7d2e7519e3a1fc6be18a4f7da2f37bbf0fcd65f2f4cf46724aed83fa0f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many hosted on disposable domains or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://internet-trade.cz/UserFiles/file/pewowitezopujomezukape.pdf In PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137983abbfbb---39098055470.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/17038690247.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/12195429281.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb689df768---bujunetubikis.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210903060818068.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kijoranagokaves.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce19939800---51860963472.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/56863978875.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e88c20e8a---18487950051.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/21261724073.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138edd51069f---71229537216.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/dakekidemesebepazizenuza.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/sijafirijoxilodominu.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/waxenubesule.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/667fbed0bd39804c78cf9031d768c274/guwosovexisodumezila.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/61881038882.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/53890826088.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/wimujexal.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/80681842159.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/45963682859.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d25b3e1dc8---zedorojasunesesematujus.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lixilusilevatasesurivegof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mg+online+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_off0000b117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB117 17904 bytes
SHA-256: 5d8bbc112bab89691ac87aa0ca7707bca44e929295592427e5f0c3e66e1a551c
font_01_sfnt_off0000dd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 10148 bytes
SHA-256: e08f69f94f35c8d8975ca06138318ab7b5a824bd3717c3508f2b6bae31eca6ee