Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fbf00c0ee53070…

MALICIOUS

PDF

78.1 KB Created: 2021-07-31 15:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80c1d2210c3cda645ad7710490201a9d SHA-1: 00261c6c0f1921974851a64ed166e71b016a5510 SHA-256: e9fbf00c0ee530708d95a8fb0f9615dff23fd4215e63b6c9bce30e8b23fc205f
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external sites, some hosted on compromised CMS platforms. The presence of numerous URLs, many pointing to disposable hosting or potentially compromised content management systems, strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://spiuruguay.com/ckfinder/userfiles/files/muvijukuje.pdf In PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/naretidima.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/dudatejelesuxusi.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/49426421666.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/ronoxoxojolofemozosot.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/kurib.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/40773921326.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/zofavov.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12b854e336---55662184736.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079c064a7f93---mexulizopalewojogel.pdfIn PDF document text
    • https://scalper.ir/data/files/file/63741165710.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/26519295332.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1e7f5ea35---guzewilakajupeki.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d6719a2a00d---49868417631.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/xefadizapabeji.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/tokibag.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/meginefubitukaderedabatot.pdfIn PDF document text
    • https://medius.sk/userfiles/file/78236763151.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/oq9ipos442eh75hu4vsbkbf1l8/48303171871.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/wowunizakabidakava.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49f0a7c3f9---35635416813.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/lufaxajogojobezemixi.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c496ef83d69---bedomajolijepetiko.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/noworajevivevomaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ideal+esprit+eco+2+user+guidePDF 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_off0000d002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD002 16016 bytes
SHA-256: 13a7e1b2567ba190e6bd31443e32aa1573b2e51d51e2fff6e79d73d0b0deef4a
font_01_sfnt_off0000f925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF925 10756 bytes
SHA-256: 31d07087d8787cf994efbaf0d233602f15fa5b853cff214ee64d18c7be6ed4ea
font_02_sfnt_off000111dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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