Malicious PDF — malware analysis report

Static analysis result for SHA-256 91faeb2240540909…

MALICIOUS

PDF

96.6 KB Created: 2021-08-04 11:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 44a63ebb053cbedd2d055cba84372c13 SHA-1: 98c39eee35812f63d194d29658ccfc4ea72aeb15 SHA-256: 91faeb2240540909af09b36fa58ccba398f6560a78729bcf027371a3b601617c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to websites, some hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=tissot+t+touch+expert+solar+2+manual+pdf PDF link annotation
    • http://altinay-law.com/images/file/91191276439.pdfIn PDF document text
    • http://iphysiology.ru/upload/zubesa.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/tosirito.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/lebifuzonozo.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/lakivononajuladomek.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/wasinosovefajunidapodimov.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/xixidekokig.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/gazekimewadiwoderagurafab.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/najezumevegenar.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/0kjhsvsvuc2b11t5u7nem28h10/12112054149.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609401bc16f96---likavabawomasepira.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/68305243036.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/67566131059.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/1383b5630d7feee24d8f1fb293ca9f26/80734331902.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/57247149880.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/edbff3117893f100ea3884bbc1d354c0/17144735038.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/f1fg6mnhbj260bhs4gm1il13sv/nevabujefoj.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/rawaxegikanezufojavef.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16087826a7581f---kosatif.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/8147305874.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/gijesurage.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/bopugaruzif.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/7127536508.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_off00010a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 23208 bytes
SHA-256: 92e60753388517125a908f00b679e5e1b7ffd74e5c2fb43aadbb865061fa5f35
font_01_sfnt_off000142d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D1 11168 bytes
SHA-256: c1a0dd860fcccfaf5860448dbc1d53a3323a26eb2810036c320a4765d977f1b2
font_02_sfnt_off00015cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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