Malicious PDF — malware analysis report

Static analysis result for SHA-256 478fe76c8849d872…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 05:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03af02131f22bf041fe160e8066283df SHA-1: 2b094a57a1dc80a882ac33f024c2555d5fa264e1 SHA-256: 478fe76c8849d8721fff662297334911f33223d7d1540de17bfbc4a089aeb3b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 are hosted on compromised CMS platforms. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://prospr.fr/ckfinder/userfiles/files/najatadogemugovanobakudu.pdf In PDF document text
    • http://omgmediatank.com/userfiles/files/jajuze.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/noduxogewod.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/vefilefizatekafiren.pdfIn PDF document text
    • https://soechi.net/userfiles/file/wizasajopifuvumez.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/1587626246.pdfIn PDF document text
    • http://dobermanncz.eu/files/85638951428.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/99812025639.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210912_F46C4AD8CCB87848.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/40728852203.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/u0nuccqc42ahcg5l7snm67qc5p/parilizikani.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/tevapiwikerigataxu.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7c0fea252---89487818184.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210910065204.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/bgdgiti7gvjvcjd6b21uv7cngg/wepazixuxejaforatovix.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/82264240359.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/71693455549.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/zekimize.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/30557307545.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78336189150.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/xowonilixaripofu.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/74290396759.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/tufexepex.pdfIn PDF document text
    • http://medi-sen.com/files/files/28636681503.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/sekujibekadogij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=family+guy+season+16+123moviesPDF 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_off0000bf2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2E 17476 bytes
SHA-256: fb4ae110555d6788c4f2fec4af92ec1fb3a0a87f4a0096918b1e598452a15bcb
font_01_sfnt_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 11020 bytes
SHA-256: e510ff95adfa8faacd366fcf692e74649401c99d073ff3450a6573ffc6c085ce
font_02_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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