Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7baa3b3c5b41ba9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 20:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c97f18e7967c080df8cc8a80ea94121a SHA-1: df77e255f574bec767108c955378d294547798af SHA-256: e7baa3b3c5b41ba9b397a59eb95b819a46206f4f05a4cef680304cdc1d09832d
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised or disposable hosting. The presence of 'utm_term_redirector=True' suggests an attempt to manipulate search engine results or track user clicks, further indicating a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://woori-tour.kr/FileData/ckfinder/files/20210917_438ED4B3D3AC5B85.pdf In PDF document text
    • http://vetcasatenovo.it/userfiles/files/gerexuwipiwejejevozeguwan.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/bumage.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/mutibemaza.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/10803334175.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/xuwedejebeweni.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145099b398d7---defudazarimus.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/dofezofukovar.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffb219d70f---fuvus.pdfIn PDF document text
    • http://pwharrison.com/userfiles/file/wufuguninazadamolaw.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///nuvutobo.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/25492535366.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090720485543.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/redejedubexafusubifet.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/radigigugujozinuwujewod.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aa75c9df3---26838454258.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/8902212405.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/zopenepeparujaporunoj.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/vunagazixoxu.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614161ec7b133---madimom.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/lulimatalufi.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210901060308.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/ratifitusovuzefezus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pubg+ios+launchPDF 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_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 17548 bytes
SHA-256: 35e58325a5ec2fc6b9ff2e2de9ce8daf10dc5f0d8e5845cd95a8adfeb6a7b2c4
font_01_sfnt_off000104c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 10420 bytes
SHA-256: 8f3ae5ef6201f41351626a9c531711814ce158cd73c64f42a235eed5580e4e23

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