Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef8f4c873ed7b13…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 15:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d394ee78980ef14a50fdefefc6fa3a60 SHA-1: 0533b3091dddb8a2c0126b3428daf8d5b9101e70 SHA-256: 0ef8f4c873ed7b13d30e73191adbfdad08b17b6d48d6b47d15b0c4e7b250272c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, while heavily obfuscated, are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://makiriaszto.hu/ckfinder/userfiles/files/molupoz.pdf In PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/23041616824.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/79cdccbda35d85b40b78a5c3932fcb14/17351753485.pdfIn PDF document text
    • http://tzsunup.com/upload/53086698448.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/86874347395.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ci9ls89c77s5damnjm43goig06/fapavuvaxegesi.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/xopisalafexerep.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083421848e10---muwures.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/42340420148.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/letavasabuzub.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2de0ab07a406846f2308543633ffb473/27896741415.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/dopesidosajak.pdfIn PDF document text
    • https://bselink.com/userfiles/file/dololawebibopimudusop.pdfIn PDF document text
    • http://beadsandsupplies.com/images/file/femugojagefaninijujibagas.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e5501dd8104---bodifed.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078247869321---febize.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf23fc9bf1---repepolomusomenif.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/fixiwixaranulumup.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/wakujoduvopozebo.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/96333487961.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128533e6e97d---xojikazixojojotisivo.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/72af6f757db68a638f543f2d8498cdeb/sunasugogexirigevowuk.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kizejowovew.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1f42248f055f11ccff3b0fa7134fbb0d/wawitog.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/nadifenizijigerodumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mozzarella+cheese+making+pdfPDF 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_off0000cfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 18024 bytes
SHA-256: 19d4382e65996cec95845dcaf259b1cb7de080cc7cfbdfb1208edcaf05142dcb
font_01_sfnt_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 11116 bytes
SHA-256: 63cc7390c49335665320d4025e2b5ca6a9b383d8bf8de0e7330132b5a263ca2a

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