Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb44bd8bb9d4f79f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-10 23:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f44ef5b786488fa9dade2e980ba9fb88 SHA-1: 08e5b6af2da846736fc702542e50ef1bbc71a75c SHA-256: fb44bd8bb9d4f79f923095ce381a970943aa6eaea916f30b5a269e3bcb09dcc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://khangvietdn.com/uploads/file/suvewokeleg.pdf In PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210905183324.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/92427343296.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161364e6a910f8---tokizunisibekes.pdfIn PDF document text
    • https://estoniapools.com/contents/files/gulugikuzute.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/tixugaw.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/25035002602.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/uljths4pu13gvr9jmr85re35jr/konuledeseziwutilik.pdfIn PDF document text
    • http://usagimatur.com/files/others/49586228884.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/82537992611.pdfIn PDF document text
    • http://ciskmv.com/css/file/45103125276.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/50586487615.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/e41mpcpkjjao76o1mi6g5qvsuh/kolipirazapapuromavuvaliz.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/27309949576.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/vafidujurogimevopos.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613440cea7fd6---88850836085.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/99f4d90c56ac138d9efca49a086fda74/togigonemiduvak.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210909_2699ADC90E27C263.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/3392454779.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/40558150724.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab5db5f82---dalogarufujogaza.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad8f0078e6---xekenutaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mx+camera+pro+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_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 20456 bytes
SHA-256: a974cf5d8ea4073f644029628e37f2264dc3fa5d2af41e3e3eda0853f5cd2141
font_02_sfnt_off0001299b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299B 10216 bytes
SHA-256: bdc65c7bce03eb367dcea39d4e92f9f45361ba2da7dac08dba8a9aa344317b14

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