Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6808f483a6dd7fb…

MALICIOUS

PDF

89.2 KB Created: 2021-09-10 11:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0d56c93d3ac4d4cb26770467fe4b53e6 SHA-1: 5256c55e3d873b252396b34b14a551ca979f52de SHA-256: d6808f483a6dd7fb11c6913f798fa981e415bae863233e4e207728d174e336f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to obscure the ultimate destination and evade detection. While no scripts were directly extracted, the nature of the URL distribution and the ClamAV detection points towards a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://fajndoktor.cz/images/file/files/78243710217.pdf In PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/48536109325.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/85637426111.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/xixil.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/sulizilofigokuvuwekabomos.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/zasikusowakuzoge.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/7739459770.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/mezifiwizetojokega.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/fefipek.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/tevubejufonugixiw.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/givaraxab.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210910_130743_199.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/39265883827.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/jatefirodanurirobadab.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/47038598755.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/fekatixodarajozuf.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/88670dbee380cd5a30ab0cb1997e5abe/fopekajuzigovumuf.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/37247489708.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109050624338443.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/voxarunav.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/94444417531.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/69379168097.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/2ed182c1862c269e2ea25478282ef852/rutavevo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161351a2da1f62---16719265787.pdfIn PDF document text
    • http://chineseclothingonline.net/File/76544200032.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/punak.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/jififopodorusijitol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=new+pc+multiplayer+games+2021PDF 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_off0000f8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 16992 bytes
SHA-256: 8295a9045c9b0c66239f079cca8e8c34b102f5b9386981fdd9179324fa8daf9d
font_02_sfnt_off00013d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2B 11064 bytes
SHA-256: abd7955e12e775b7e5274bfc78add55ea978b6980d250868bee01ee3e30365cb

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