Malicious PDF — malware analysis report

Static analysis result for SHA-256 36430d7a16232f09…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 15:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c83886f13ddc4019225c106d2019e057 SHA-1: d883a254243e5d31484587d195d97f8ec920f10d SHA-256: 36430d7a16232f094c28ff9d113bbd30dd02d2aa08c57e8c8c5d1af5e8e55072
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://chcial.ru/uplcv?utm_term=nfs+shift+android+gameplay PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5c0a7a9f---lozeparosotazuviloba.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161386ff83ef6f---bafozukinorewufe.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210909070601.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e195992204e3919e660276fb5c9d300b/71666673284.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/fejuw.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/91644877790.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/vikijusemawenuborix.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36898209014.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/xibuludejiwe.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090222320432.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9kb2s4j7eicfdb8v8uisa64uro/sivavusonanotuxujo.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/6947562601.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/pikusebugo.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/fivadefub.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///fatopimusimome.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/84865534804.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/50646959798.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/86350327023.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/51183233728.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/nobosetav.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/vekuxawaketadex.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/vuwajazozi.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/gijujevexigutejasi.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • https://yapluka-services.fr/userfiles/file/gidowisudibimas.pdfIn PDF document text
    • 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_off0000cbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD7 11036 bytes
SHA-256: 24e31d7860396c0582007a4f3b205736de27dba65bde1c938c4e41ef04d72ba3
font_01_sfnt_off0000e51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 16856 bytes
SHA-256: f9c6f74136937c6d1169e84206de9bb0e9d51b2d71b4e3185e6ec5817caec3ea
font_02_sfnt_off000110ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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